Here is a scenario:
    * SIP UA is running on a Mobile Device (Smart phone); the UA is capable of 
Symmetric RTP.
    * The UA device is on Cellular and an RTP session is going on through SEMS
    * The UA device moves into WiFi and its IP changes abruptly
    * The UA device keeps sending outbound RTP as usual to the SEMS using the 
new IP (i.e. Audio is through one way)
    * But the SEMS doesn't send the inbound RTP to the new IP:port of the NAT 
router (of the UA device).

Wondering, if there is way to make the SEMS learn the new source IP:port of the 
outbound RTP 
And transmit the inbound RTP to this new IP:port.

Any ideas? 

Best Regards
Gary
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