WO2004084018A2

WO2004084018A2 - Integrated customer premises equipment device

Info

Publication number: WO2004084018A2
Application number: PCT/US2004/007311
Authority: WO
Inventors: Joel M. Krause; G. Lance Lockhart; John Truetken; Christopher Martin; Jeffrey Haltom
Original assignee: Worldcom, Inc.
Priority date: 2003-03-13
Filing date: 2004-03-11
Publication date: 2004-09-30
Also published as: WO2004084018A3; US20040181686A1; US8503437B2

Abstract

A Session Initiation Protocol (SIP) device includes one or more voice ports configured to provide voice services; one or more data ports configured to provide data services; firewall logic configured to filter incoming traffic; and quality of service (QoS) logic configured to provide QoS services for traffic transmitted from the SIP device.

Description

INTEGRATED CUSTOMER PREMISES EQUIPMENT DEVICE

FIELD OF THE INVENTION [0001] The present invention relates generally to communications networks and, more particularly, to an integrated customer premises equipment (CPE) device.

BACKGROUND OF THE INVENTION

[0002] Telecommunications service providers continually increase the number of services and products they offer to customers. A recent trend, for example, is a desire to offer secure broadband, wireless, and Internet services. As competition increases, service providers will need to provide an increased level of support for these advanced data services while keeping costs down.

[0003] Many components are often necessary to build a secure telecommunications network. Whether a customer desires Internet access or a firewall, the customer is typically forced to support many different pieces of equipment in their network. For many small to medium sized businesses desiring an effective network, continuing to add new hardware for each new service or feature can be quite costly.

[0004] Accordingly, there is a need in the art for a "one box" solution that provides customers with various features and services of interest to the customers.

SUMMARY OF THE INVENTION

[0005] Systems and methods consistent with the principles of the invention address this and other needs by providing an integrated Session Initiation Protocol (SIP) enabled CPE device that provides customers with firewall capabilities, quality of service (QoS) processing, routing capabilities, and Ethernet switching functionality. [0006] In an implementation consistent with the present invention, a network device includes one or more voice ports configured to communicate with one or more analog devices; one or more data ports configured to communicate with one or more SIP devices; one or more network ports configured to communicate with a network; filtering logic configured to filter traffic received from the one or more network ports; and QoS logic configured to perform QoS processing on traffic received from the one or more voice ports, the one or more data ports, and the one or more network ports.

[0007] In another implementation consistent with the present invention, a network device includes at least one voice port configured to communicate with at least one analog telephone; at least one voice trunk configured to communicate with a private branch exchange; at least one data port configured to communicate with at least one SIP device; at least one network port configured to communicate with a network; and management logic configured to provide QoS management and security for the at least One voice port, the at least one voice trunk, the at least one data port, and the at least one network port. [0008] In yet another implementation consistent with the present invention, a network device includes means for communicating with at least one analog telephone device; means for communicating with at least one SIP device; means for communicating with a network; means for providing QoS services for traffic received via the means for communicating with at least one analog telephone device, the means for communicating with at least one SIP device, and the means for communicating with a network; means for filtering traffic received from the network; and means for providing at least one of network address translation and port address translation.

[0009] In a further implementation consistent with the principles ofthe invention, a

SIP device includes one or more voice ports configured to provide voice services; one or more data ports configured to provide data services; firewall logic configured to filter incoming traffic; and QoS logic configured to provide QoS services for traffic transmitted from the SIP device.

BRIEF DESCRIPTION OF THE DRAWINGS [0010] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment ofthe invention and, together with the description, explain the invention. In the drawings,

[0011] Fig. 1 illustrates an exemplary system in which systems and methods, consistent with the present invention, may be implemented;

[0012] Fig. 2 illustrates an exemplary configuration ofthe interface device of Fig. 1 in an implementation consistent with the principles ofthe invention;

[0013] Fig. 3 illustrates an exemplary configuration ofthe management logic of Fig. 2 in an implementation consistent with the principles ofthe invention; [0014] Fig. 4 illustrates an exemplary topology biding operation of the network address translation (NAT)/port address translation (PAT) logic of Fig. 3 according to an implementation consistent with the present invention;

[0015] Fig. 5 illustrates an exemplary configuration ofthe voice port logic of Fig. 2 in an implementation consistent with the principles ofthe invention; [0016] Fig. 6 illustrates an exemplary process for routing traffic from a network through the interface device in an implementation consistent with the principles ofthe invention; and

[0017] Fig. 7 illustrates an exemplary process for routing traffic from one or more customer devices through the interface device in an implementation consistent with the principles ofthe invention. DETAILED DESCRIPTION [0018] The following detailed description of implementations consistent with the present invention refers to the accompanying drawings. The same reference numbers in different drawings may identify the same or similar elements. Also, the following detailed description does not limit the invention. Instead, the scope of the invention is defined by the appended claims and equivalents.

[0019] Implementations consistent with the present invention provide an integrated

SlP-enabled CPE device that provides customers with, inter alia, a firewall, quality of service (QoS) processing, routing capabilities, and Ethernet switching functionality.

EXEMPLARY SYSTEM [0020] Fig. 1 illustrates an exemplary system 100 in which systems and methods, consistent with the present invention, may be implemented. As illustrated, system 100 may include a group of user devices 120 that connect to a network 110 and a group of customer devices 130 that connect to network 110 via an interface device 140. The number of devices illustrated in Fig. 1 is provided for simplicity. In practice, a typical network could include more or fewer user devices 120, customer devices 130, and interface devices 140 than illustrated in Fig. 1.

[0021] Network 110 may include one or more networks, such as the Internet, an intranet, a local area network (LAN), a wide area network (WAN), or another type of network that is capable of transmitting voice and data communications from a source device to a destination device. Network 110 may also include one or more public switched telephone networks (PSTNs).

[0022] User devices 120 may include devices, such as personal computers, laptops,

SIP telephone devices, or otiier devices capable of transmitting/receiving voice and data communications to/from network 110. User devices 120 may connect to network 110 via wired, wireless, or optical connections. Customer devices 130 may include any common customer telephone device, such as one or more analog telephones, private branch exchanges (PBXs), SIP telephone devices, and/or other types of wired or wireless devices. As shown in Fig. 1, customer devices 130 may be part of a customer's LAN. [0023] Interface device 140 is a stand-alone device that provides secure communication services to customer devices 130. To provide these communication services, interface device 140 supports a variety of protocols, such as the Internet Protocol, the Dynamic Host Configuration Protocol, the Session Initiation Protocol, the User Datagram Protocol, the Transmission Control Protocol, the Session Description Protocol, the Real-time Transport Protocol (RTP), the Real-time Transport Control Protocol, the Audio Video Protocol, the T.38 fax protocol, the Internet Control Message Protocol, and other types of communication protocols.

[0024] As will be described in detail below, interface device 140 provides customer devices 130 with digital subscriber line (DSL) and frame relay access to network 110. Interface device 140 may also provide voice ports for stand-alone analog telephones, Tl or fractional Tl voice trunks for PBX connectivity, Ethernet ports and routing capabilities for data devices, firewall functionality, network address translation (NAT) and port address translation (PAT) functionality, and QoS management.

[0025] Fig. 2 illustrates an exemplary configuration of interface device 140 in an implementation consistent with the principles of he invention. As illustrated, interface device 140 may include DSL logic 210, frame relay logic 220, management logic 230, signal/bearer conversion logic 240, voice port logic 250, and data port logic 260. It will be appreciated that interface device 140 may include other logic than that illustrated in Fig. 2 that aid in the reception, processing, and/or transmission of data.

[0026] DSL logic 210 may include one or more DSL ports. In one implementation,

DSL logic 210 may include one or more RJ-11 interfaces. DSL logic 210 supports well- known DSL protocols for communicating with digital subscriber line access multiplexers (DSLAMs), such as an integrated services digital network digital subscriber line (IDSL) signaling protocol, a symmetric digital subscriber line (SDSL) signaling protocol, and a Global.standard High-bit-rate digital subscriber line (G.SHDSL) signaling protocol, and the like.

[0027] Frame relay logic 220 may include one or more frame relay ports. In one implementation, frame relay logic 220 may include one or more digital signal 1 (DS1) American National Standards Institute (ANSI) T1.102 electrical line rate interfaces that support fractional Tl or full Tl line rates.

[0028] Management logic 230 manages operation of interface device 140.

Management device 230 provides security and QoS functions for interface device 140. Management device 230 also provides for secure methods of file transfer, for the purpose of application upgrades, log downloads, etc.

[0029] Fig. 3 illustrates an exemplary configuration of management logic 230 in an implementation consistent with the principles ofthe invention. As illustrated, management logic 230 may include firewall logic 310, QoS management logic 320, a clock 330, an echo canceller 340, network management logic 350, and network address translation (NATVport address translation (PAT) logic 360. It will be appreciated that management logic 230 may include other components that aid in the reception, processing, and/or transmission of data. [0030] Firewall logic 310 provides packet filtering capabilities. In one implementation, this filtering may be based on a set of rules that causes firewall logic 310 to perform an action on incoming traffic based on source Internet Protocol (IP) address, source transport address, destination IP address, destination transport address, and the like. The performed action may include, for example, permitting the received traffic to be forwarded to customer devices 130 or discarding the traffic in the event that incoming traffic fails to satisfy the set of rules associated with firewall logic 310. Firewall logic 310 may include one or more dynamic rule sets for media based on SIP signaling.

[0031] QoS management logic 320 provides QoS services (e.g., classification, scheduling, policing, etc.) for interface device 140. In one implementation, the QoS services may include classifying incoming traffic flows, such as real-time transport protocol flows, based, for example, on packet header information (or other information). QoS management logic 320 may also implement class-based scheduling with priority queuing to provide low delay, low delay variation, and low loss rate for voice over IP (VOIP) traffic. QoS management logic 320 may also provide reporting capabilities, such as providing bandwidth usage reports, statistics on the number of dropped packets on a flow or class basis, traffic reports, such as traffic breakdown by user, by site, by network connection, etc., or other reports of interest to the customer.

[0032] Clock 330 provides a reference clock signal for use by interface device 140.

Clock 330 may derive the reference clock signal from selected interfaces and/or from external timing interfaces (e.g., from an external DS1 timing interface). Interface device 140 may use the reference clock signal for synchronization purposes and/or for jitter/wander requirements. Echo canceller 340 provides echo control/cancellation for interface device 140. In one implementation, echo canceller 340 may include an ITU G.168-compliant echo canceller. [0033] Network management logic 350 provides fault management, configuration management, accounting, performance management, and security functions for interface device 140. With respect to fault management, network management logic 350 detects, logs, and notifies users of, and, if possible, fixes problems to keep the network running effectively. Network management logic 350 may include alarm mechanisms to alert users or network administrators of, for example, system faults, network interface problems, hardware/software failures, and the like. Network management logic 350 may log protocol events (for both circuit-switched and SIP protocols) as they relate to call processing, call failures, and call abandonments with an explanation ofthe cause, and incoming messages that are incorrectly formatted, timestamp the logs, and monitor the number of active calls on interface device 140 at any given time.

[0034] With respect to configuration management, network management logic 350 may monitor network and interface device 140 configuration information so that the effects on network operation of various hardware and software elements can be tracked and managed. In one implementation, network management logic 350 may adhere to the SIP Management Information Base (MIB) User-Agent requirements that are known to those skilled in the art.

[0035] With respect to accounting, network management logic 350 may measure network-utilization parameters so that individual or groups of users on the network can be regulated appropriately. This information may be used for creation of billing information, as well as usage patterns.

[0036] With respect to performance management, network management logic 350 may measure and make available aspects of network performance, such as network throughput, user response times, and line utilization, so that inter-network performance can be maintained at an acceptable level. Network management logic 350 provides users with the ability to view the status of various interface device 140 components, such as Foreign Exchange Station (FXS)/Foreign Exchange Office (FXO) voice ports, trunk groups, and the like, and to enable and disable components of interface device 140. Network management logic 350 may also provide real-time statistics and counters related to a traffic stream. The statistics and counters may track jitter, latency, lost packets, error packets, packets that are out of sequence, dialed call completions, etc.

[0037] With respect to security management, network management logic 350 may control access to network resources so that the customer's network cannot be compromised and those without appropriate authorization cannot access sensitive information. In one implementation, network management logic 350 rejects or allows messages based on the address of the sender.

[0038] Network management logic 350 may also provide the ability to remotely control and configure interface device 140. Alternatively, network management logic 350 may allow interface device 140 to be controlled and/or configured via a serial connection. In either event, network management logic 350 may allow for the creation, modification, and editing of bandwidth policy, or the addition or modification of customer features and/or services. Access to interface device 140 may occur via a secure terminal emulation protocol, such as Secure Shell (SSH).

[0039] NAT/PAT logic 360 provides security and signal processing for traffic transmitted between customer devices 130 and network 110. NAT/PAT logic 360 may provide topology hiding capabilities, as illustrated in Fig. 4. NAT/PAT logic 360 hides the topology ofthe internal network (i.e., the network including customer devices 130) from external devices by translating network addresses and/or port addresses associated with customer devices 130 to one external address (e.g., an external IP address). It will be appreciated that SP, the session description protocol (SDP), and the real-time transport control protocol (RTCP) embed host names, as well as IP addresses, into packets. To hide the internal network topology, NAT/PAT logic 360 may modify NAT, PAT, or secure flow processing (SFP) functionality to hide all internal addresses that may be embedded within SIP and RTCP packets with the external IP address(es) as they traverse interface device 140. In one implementation, NAT/PAT logic 360 dynamically assigns network addresses and port addresses to customer devices 130. NAT/PAT logic 360 may perform network address and port address translation at the session, presentation, and/or application layer. [0040] Returning to Fig. 2, signal/bearer conversion logic 240 performs all necessary conversions for traffic transmitted between management logic 230 and voice port logic 250. In one implementation, signal/bearer conversion logic 240 performs signaling protocol conversion for traffic transmitted between a PBX and management logic 230. The signaling protocol conversion may include, for example, conversions between the SIP signaling protocol and the ISDN signaling protocol. Signal/bearer conversion logic 240 may also perform bearer channel conversion for traffic transmitted between an analog telephone and management logic 230. The bearer channel conversion may include, for example, conversions between an RTP format and an analog format.

[0041] Voice port logic 250 may include one or more ports for supporting Foreign

Exchange Station (FXS) and Foreign Exchange Office (FXO) voice lines and fractional Tl and full Tl voice trunks. In one implementation, voice port logic 250 may include one or more RJ-11 FXS voice port electrical line rate interfaces, one or more RJ-11 FXO voice port electrical line rate interfaces, and one or more DS1 ANSI T1.102 electrical line rate interfaces. Voice port logic 250 supports well-known signaling protocols, such as Foreign Exchange Station Loop Start (FXSLS), Foreign Exchange Office Loop Start (FXOLS), Foreign Exchange Station Ground Start (FXSGS), Foreign Exchange Office Ground Start (FXOGS), ANSI PRI (Q.931) signaling protocol, and the like. Voice port logic 250 may also support Channel Associated Signaling (CAS) trunk types, dual tone multi-frequency (DTMF) dialed number transmittal and receipt over CAS trunk groups, multi-frequency (MF) dialed number transmittal and receipt over CAS trunk groups, sub-Tl-size CAS trunk groups, and the like.

[0042] Fig. 5 illustrates an exemplary configuration of voice port logic 250 in an implementation consistent with the principles ofthe invention. As illustrated, voice port logic 250 may include voice ports 510 and voice trunks 520. Voice ports 510 may include one or more ports capable of supporting FXS/FXO voice lines for analog telephones. Voice trunks 520 may include voice trunks for supporting fractional Tl and/or full Tl line rates. Voice trunks 520 may connect to one or more PBXs.

[0043] Returning to Fig. 2, data port logic 260 may include one or more ports for supporting lxN base T Ethernet, where N equals, 10, 100, etc. In one implementation, data port logic 260 supports 10 Mb/s half duplex Ethernet, 10 Mb/s full duplex Ethernet, 100 Mb/s half duplex Ethernet, 100 Mb/s full duplex Ethernet, 10/100 half/full auto-negotiation, wireless networking, virtual local area network (VLAN) tagging, and the like.

EXEMPLARY PROCESSING [0044] Fig. 6 illustrates an exemplary process for routing traffic from network 110 through interface device 140 in an implementation consistent with the principles of he invention. Processing may begin with interface device 140 receiving traffic from a user device 120 via network 110 (act 610). It is assumed hereinafter that the received traffic is SIP traffic. It will be appreciated, however, that implementations consistent with the principles of the invention are equally applicable to other traffic types. The traffic may be received via DSL logic 210 or frame relay logic 220 and may, for example, be in the form of packets. Once received, the traffic may be filtered via firewall logic 310 (Fig. 3) (act 620). Firewall logic 310 may examine the incoming traffic and determine, based on a predetermined set of rules, whether to, for example, discard the traffic or forward the traffic toward its destination.

As set forth above, firewall logic 310 may filter traffic based on source IP address, source transport address, destination IP address, destination transport address, and the like.

[0045] Interface device 140 may then perform QoS processing on the traffic (act 630)

QoS management logic 320 may, for example, classify the traffic and schedule the traffic based on the classification. Based on the particular destination customer device 130 to winch the traffic is destined, interface device 140 may process the traffic to put the traffic in a format suitable for the particular destination customer device 130 (act 640). For example, if the traffic is to be transmitted to an analog telephone or PBX,. interface device 140 may perform any necessary bearer channel conversion or signaling conversion. In those situations where the received traffic is destined for a SIP -based device, such as a SIP telephone, signal processing may not be necessary.

[0046] Interface device 140 may then transmit the traffic to the appropriate customer device 130 (act 650). The traffic may be transmitted via voice port logic 250 or data port logic 260, based upon the particular customer device 130 to which the traffic is destined. If, for example, the traffic is destined for an analog telephone or a PBX, interface device 140 may transmit the traffic through voice port logic 250. If, on the other hand, the traffic is destined to a SIP device, such as a SIP telephone, interface device 140 may transmit the traffic through data port logic 260.

[0047] Fig. 7 illustrates an exemplary process for routing traffic from one or more customer devices 130 through interface device 140 in an implementation consistent with the principles of the invention. Processing may begin with interface device 140 receiving traffic from one or more customer devices 130 (act 710). The traffic may be received via voice port logic 250 or data port logic 260 and may, for example, be in the form of packets, analog signals, or ISDN signals.

[0048] Based on the particular customer device 130 from which the traffic is received, interface device 140 may process the traffic to put the traffic in a form suitable for transmission on network 110 (act 720). For example, if the traffic is received via voice port logic 250, interface device 140 may perform any necessary bearer channel conversion or signaling conversion. In those situations where the traffic is received via data port logic 260, signal processing may not be necessary since the traffic may already be in a form suitable for transmission on network 110.

[0049] Interface device 140 may then perform QoS processing on the traffic (act 730).

QoS management logic 320 may, for example, classify the traffic and schedule the traffic based on the classification. Interface device 140 may translate a source address associated with the received traffic to a network address (act 740). This address translation may be NAT or PAT and acts to hide addresses of customer devices 130 from user devices 120 connected to network 110. As described above, the address translation may be performed at the session layer, presentation layer, and/or application layer.

[0050] Interface device 140 may transmit the traffic to network 110 (act 750). The traffic may be transmitted via DSL logic 210 or frame relay logic 220 and may be formatted accordingly based upon the particular port (i.e., DSL or frame relay) from which the traffic is transmitted.

CONCLUSION [0051] Systems and methods, consistent with the present invention, provide an integrated SIP-enabled CPE device that provides customers with a firewall, QoS processing, routing capabilities, and Ethernet switching functionality. This single CPE device allows customers to update or add new features and/or services without having to continually buy new hardware to obtain these features/services.

[0052] The foregoing description of exemplary embodiments of the present invention provides illustration and description, but is not intended to be exhaustive or to limit the invention to the precise form disclosed. Modifications and variations are possible in light of the above teachings or may be acquired from practice ofthe invention. For example, while series of acts have been described with respect to Figs. 6 and 7, the order ofthe acts may be varied in other implementations consistent with the present invention. Moreover, non- dependent acts may be implemented in parallel.

[0053] Certain portions of the invention have been described as "logic" that performs one or more functions. This logic may include hardware, such as an application specific integrated circuit or a field programmable gate array, software, or a combination of hardware and software. Thus, the present invention is not limited to any specific combination of hardware circuitry and software.

[0054] No element, act, or instruction used in the description ofthe present application should be construed as critical or essential to the invention unless explicitly described as such. Also, as used herein, the article "a" is intended to include one or more items. Where only one item is intended, the term "one" or similar language is used. [0055] The scope of the invention is defined by the claims and their equivalents.

Claims

WHAT IS CLAIMED IS:

1. A network device comprising: one or more voice ports configured to communicate with one or more analog devices; one or more data ports configured to communicate with one or more Session Initiation Protocol (SIP) devices; one or more network ports configured to communicate with a network; filtering logic configured to filter traffic received from the one or more network ports; and quality of service (QoS) logic configured to perform QoS processing on traffic received from the one or more voice ports, the one or more data ports, and the one or more network ports.

2. The network device of claim 1 further comprising: at least one of a network address translator and a port address translator.

3. The network device of claim 1 wherein the one or more voice ports include: at least one Foreign Exchange Station (FXS)/Foreign Exchange Office (FXO) voice port, and at least one of a Tl and fractional Tl trunk group.

4. The network device of claim 1 further comprising:

SIP/Time Division Multiplex (TDM) conversion logic connected to the at least one FXS/FXO voice port and the at least one of a Tl and fractional Tl trunk group and configured to translate signals between SIP and a TDM signaling protocol.

5. The network device of claim 1 wherein the analog devices include at least one of an analog telephone and a private branch exchange.

6. The network device of claim 1 wherein the one or more data ports include at least one Ethernet port.

7. The network device of claim 1 wherein the one or more network ports include at least one digital subscriber line (DSL) port and at least one frame relay port.

8. The network device of claim 1 wherein the filtering logic includes a firewall configured to filter the traffic received from the one or more network ports based on a set of rules.

9. The network device of claim 1 wherein the QoS processing includes: classifying traffic received from the one or more voice ports, the one or more data ports, and the one or more network ports, and scheduling the traffic received from the one or more voice ports, the one or more data ports, and the one or more network ports based on the classifying.

10. The network device of claim 1 further comprising: a clock configured to generate a reference clock signal; and an echo canceller configured to provide echo control and cancellation.

11. The network device of claim 1 further comprising: network management logic configured to provide one or more of fault management, configuration management, accounting, performance management, and security for the network device.

12. The network device of claim 11 wherein, when providing fault management, the network management logic detects faults associated with the network device.

13. The network device of claim 11 wherein, when providing configuration management, the network management logic monitors configuration information associated with the network device.

14. The network device of claim 11 wherein, when providing accounting, the network management logic measures one or more network-utilization parameters.

15. The network device of claim 11 wherein, when providing performance management, the network management logic measures one or more parameters associated with network performance.

16. The network device of claim 11 wherein the network management logic is further configured to allow the network device to be remotely controlled and configured.

17. A network device comprising: at least one voice port configured to communicate with at least one analog telephone; at least one voice trunk configured to communicate with a private branch exchange; at least one data port configured to communicate with at least one Session Initiation Protocol (SIP) device; at least one network port configured to communicate with a network; and management logic configured to provide quality of service (QoS) management and security for the at least one voice port, the at least one voice trunk, the at least one data port, and the at least one network port.

18. The network device of claim 17 wherein the at least one voice port includes a Foreign Exchange Station (FXS)/Foreign Exchange Office (FXO) voice port.

19. The network device of claim 17 wherein the at least one voice trunk includes at least one of a Tl and fractional Tl voice trunk.

20. The network device of claim 17 further comprising: a converter connected to the at least one voice port and the at least one voice trunk and configured to perform a bearer channel conversion and a signaling conversion.

^' 21. ^• The network device of claim 17 wherein the at least one data port includes an Ethernet port.

22. The network device of claim 17 wherein the at least one network port includes one or more of a digital subscriber line (DSL) port and a frame relay port.

23. The network device of claim 17 wherein the management logic includes a firewall configured to filter traffic received from the network.

24. The network device of claim 17 wherein the management logic includes a network address translator (NAT) and a port address translator (PAT).

25. The network device of claim 17 wherein^" the network device includes a customer premises equipment (CPE) device.

26. A network device comprising: means for communicating with at least one analog telephone device; means for communicating with at least one Session Initiation Protocol (SIP) device; means for communicating with a network; means for providing quality of service (QoS) services for traffic received via the means for communicating with at least one analog telephone device, the means for communicating with at least one SIP device, and the means for communicatmg with a network; means for filtering traffic received from the network; and means for providing at least one of network address translation and port address translation.

27. The network device of claim 26 wherein the at least one analog telephone device includes at least one of an analog telephone and a private branch exchange.

28. The network device of claim 26 wherein the means for communicating with a network includes: one or more digital subscriber line (DSL) ports, and one or more frame relay ports.

29. A Session Initiation Protocol (SIP) device comprising: one or more voice ports configured to provide voice services; one or more data ports configured to provide data services; firewall logic configured to filter incoming traffic; and quality of service (QoS) logic configured to provide QoS services for traffic transmitted from the SIP device.