A PBX system using an unmodified personal computer as the host server and using expansion slots to couple one or more switch cards to the system bus, and, optionally including a network interface card to couple the PBX system to other client computers running telephony enabled applications to control...http://www.google.fr/patents/US6795448?utm_source=gb-gplus-shareBrevet US6795448 - IP packet ready PBX expansion circuit for a conventional personal computer with expandable, distributed DSP architecture
IP packet ready PBX expansion circuit for a conventional personal computer ...
