For Inbound Contact header goes missing

[Ankit Aparajey]

Hello,

When vendor is sending calls to DID/TFN calls are coming in Invite is proper, 108 Ringing signal sends proper contact SIP URI, but as soon as call is being picked contact header change to only IP : Port of my switch in middle of sip signalling. Which leads SBC of my provider to think header is being spoofed and they drop the call and re-initiate Invite message creating loop.

I checked every header in sip profile and in clients trunk since there is no option to chnage header in DID vendor trunk. but it did not worked at all.