White Paper Abstract:
This white paper will address current techniques available to address issues regarding the interoperability and coexistence of H.323 and SIP in packet telephony networks. Cisco offers packet voice solutions that offer architectural and protocol flexibility, including the choice of H.323 [International Telecommunications Union (ITU)—T Recommendation H.323], Media Gateway Control Protocol (MGCP), and Session Initiation Protocol (SIP) for signalling and call control. In particular; H.323 and SIP are often compared and contrasted with each other. MGCP is not being covered because the focus of this document is how to integrate SIP into existing H.323 networks. The premise is that most existing packet telephony customers are currently running H.323, and we are explaining a means of incorporating SIP, to enhance their networks.