McDewey

Figure 3: Creating 3-way Conference G.Clear Calls Unified Communications Manager supports voice and video calls. It also establishes a media session between two registered SIP endpoints using the G.Clear codec. A G.Clear media session uses RTP to establish a 64kbps transparent data channel between two devices. This allows data streams generated by ISDN terminals to be transparently being carried via an IP network. Refer to RFC 4040 for more details. Unified CM supports the following: 1. G.Clear codec (RFC 4040) handling in SIP signaling and codec negotiation. 2. Including SDP in the outgoing INVITE from Unified CM for G.Clear calls without requiring an MTP. Example SDP for G.Clear Call SIP endpoints capable of initiating a G.Clear calls sends the indication by using the G.Clear codec in the m=audio line of the INVITE SDP. SIP Line Messaging Guide (Standard Edition) for Cisco Unified Communications Manager 35 SIP Standard Line Interface G.Clear Calls