We have prepared a IOS SIP router for CME. The router has only one interface, directly connected to public network. The sip clients register to the CME but with local IP Address on the client and not the real public address. We have tried several settings on the CME and on the SIP client but the behaviour is very wierd. one out of 10 times, sip client registers with public ip, other times just with actual ip on the sip client.
Any advise on the special configuration required on the IOS router to resolve this issue?
Attached is the configuration related to the SIP Configuration.
What I mean to say is the SIP Client source address as seen by the router is local ip address (Actual IP address of the client like 192 168 x.x). So some times it does not register at all because router replies to the invite message but it never reaches the client because it being sent to the local IP Address.
At times it registers but the RTP never flows because of this NAT issue.
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