Version 6.2 483 February 2011
SIP User's Manual 8. IP Telephony Capabilities
The flowchart below illustrates this process:
Figure 8-47: Routing Process
8.4.3.1 Determining Source and Destination URL
The SIP protocol has more than one URL in a dialog establishing request that might
represent the source and destination URL. When handling an incoming request, the device
determines which SIP headers are used for source and destination URLs. Once these
URLs are determined, the input user and host are taken from them.
INVITE dialogs:
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