HMR to fix session version value in SDP

 Hi all,

 

I'm having an issue with an Intl. Carrier in which they increment the session version each SIP message we receive.

 

This is causing our SIP server to release the call, according to RFC 3261 the session version should be kept equal except the session changes.

 

1-) 180 Ringing: Owner/Creator, Session Id (o): - 20245313 20245313 IN IP4 89.221.44.65

2-) 183 Session Progess: Owner/Creator, Session Id (o): - 20245313 20245314 IN IP4 89.221.44.65

3-) 180 Ringing: Owner/Creator, Session Id (o): - 20245313 20245315 IN IP4 89.221.44.65

4-) 200 OK: Owner/Creator, Session Id (o): - 20245313 20245316 IN IP4 89.221.44.65

 

How can I prepare a HMR to fix the session version value. For ex: our sip server must receive