[SIPForum-discussion] sip prack

[Zuñiga, Guillermo]

Hi fellows.
I would like to understand the following.
I have the scenarios A call B.
In the first invite I am seeing that include the header "Supported: 100rel" and then my GW is sending back a 180Ringing/SDP  with "Required: 100rel",  and after 7 more 180 my GW is killing the session with 504 Server Time Out.

Question:
1-What means that "Supported: 100rel" in the first invite coming from the Peer?
2-What means that "Required: 100rel" back in the 180 from my GW? What my GW are expecting receive from the Peer? Why is sending 7 more 180 to the Peers?
3-Why then after a timer is killing the session with 504 Server Time out?

4-What could happen is don’t send back from my GW "Required: 100rel" in the 180, session could continue? What should send me Peer in this case?

Thanks a lot for all the feedback.
Thanks
Guillermo





Guillermo Zuniga
Especialista de Soporte Técnico
Gerencia de Soporte Técnico

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