A system comprising: an IP telephony interface communicatively coupled to an IP telephony service; a secondary telephony interface communicatively coupled to a secondary telephony service; and a telephone connection module to select between the IP telephony service and the secondary telephone service...http://www.google.fr/patents/US7688803?utm_source=gb-gplus-shareBrevet US7688803 - System and method for coordinating between multiple telephony channels
System and method for coordinating between multiple telephony channels
