Hi! I have a problem with my ISP and SIP on my 2811.
My number 2922781 register well, I don't have a problem with incoming calls. But outgoing calls fails. ISP's techsupport sayd that problem with source port in my SIP session. My number register on SIP-server like logis@address:5060, but outgoing call come from different source port and that's why SIP-server reject call. How can I force use only 5060 port for SIP-session?
I got debugging of SIP packets. My 2811 send INVITE - UDP packet with src port 59538, dst port - 5060. My ISP sayd that call will be successful only if src port of my UDP will be 5060, because my 2811 was registered on they mediagate with port 5060 and packets from any other ports will be rejected:
SIP/2.0 487 LR2 - User not registered on this client
I find out that diffirent SIP-devices uses diffirent UDP src ports - some of them uses random port from pool, some of them always uses 5060 port. Both of this method is valid (based on SIP protocol description). But some of ISP required to use only 5060 src port. How can I configure 2811 to always send UDP SIP packet from port 5060?
IntroductionCUCM Routing RulesDial String implementation PolicyCUCM Routing LogicSIP URI Call Routing Analysis+++ Case Study: 1 ++++++ Case Study: 2 +++Conclusion
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