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Building Telephony Systems with OpenSIPS 1.6 by Flavio E. Goncalves

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Invite diagram

The following figure shows us how the packets are handled. We've included some hints in the requests to help you to trace the call in the script.

Invite diagram

Packet sequence

The following is the INVITE sequence with the mangled requests highlighted. Pay careful attention to the modified SDP after the relay of the INVITE request and the "200 OK" reply. Some requests were reduced to save space.

U 192.168.1.159:63493 -> 192.168.1.201:5060 INVITE sip:1000@192.168.1.201 SIP/2.0. Date: Tue, 15 Sep 2009 16:44:08 GMT. CSeq: 1 INVITE. Via: SIP/2.0/UDP 192.168.0.143:5067;branch=z9hG4bKb224e5a7-84a0-de11-8a33-000c29254d97;rport. User-Agent: Ekiga/2.0.12. ...

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