smalkeric Fri, 02/01/2008 - 08:44
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The main enhancements to SIP trunks in Cisco Unified CM 6.0 are the support for the iLBC and AAC codecs and SIP PUBLISH. By providing improved performance, SIP PUBLISH provides the preferred mechanism for Cisco Unified CM 6.0 to send IP phone presence information to Cisco Unified Presence over a SIP trunk.


http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/srnd/6x/trunks.html#wp1044673

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