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Building Telephony Systems with OpenSER by Flavio E. Goncalves

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Invite Diagram

Invite DiagramSIP NAT traversalinvite diagram

Packet Sequence

U 8.8.3.80:62003 -> 8.8.3.48:5060 INVITE sip:1000@8.8.3.48 SIP/2.0. Via: SIP/2.0/UDP 192.168.0.111:5060;branch=z9hG4bK31390;rport. From: 1001 <sip:1001@8.8.3.48>;tag=2824524117. To: 1000 <sip:1000@8.8.3.48>. Call-ID: 38476419-134726572@192.168.0.111. CSeq: 1 INVITE. Contact: <sip:1001@192.168.0.111:5060>. max-forwards: 70. supported: 100rel. user-agent: Voip Phone 1.0. Allow: INVITE, ACK, OPTIONS, BYE, CANCEL, REFER, NOTIFY, SUBSCRIBE, PRACK, UPDATE. Content-Type: application/sdp. Content-Length: 295 . . v=0. o=sdp_admin 30472538 21739392 IN IP4 192.168.0.111. s=A conversation. c=IN IP4 192.168.0.111. t=0 0. m=audio ...

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