主页（http://www.pttcn.net）：SIP 相关技术系列讲座开讲(2) Request Methods Response Codes SIP Headers INVITE – Example RESPONSE (200 OK) – Example More on Headers Support and Require Headers Timer (Session Times) 100rel (PRACK) Short form ‘compact’ Headers SDP – the Session Description Protocol SDP in a SIP Message 一个SDP 实例 Extending SDP Multiple ‘m’ lines Changing Session Parameters SDP Example - Put a call on Hold SDP Example - Call Hold Trace Call Hold – Old and New Methods Music on Hold example INVITE and reINVITE SIP Mobility SIP Mobility SIP Call Forking - Parallel SIP Call Forking - Sequential Call legs, dialogs and Call IDs Dialog trace example Dialogs and Transactions Branch Ids Call Forward to Voicemail Call Forward - No Answer Replaces header Diversion headers More on Proxies and SIP Routing Stateless Proxy Stateful Proxy More Proxy information VIA and Record Route VIA Details Record-Route Defined Record Route Example Loose and Strict Routing Session Policies
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