Packetizer ® Copyright © 2008 SIP Call Flows Simple? Let’s Place a Video Call to Find Out. 1.

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Presentation transcript:

Packetizer ® Copyright © 2008 SIP Call Flows Simple? Let’s Place a Video Call to Find Out. 1

Packetizer ® Initiating the Video Call… 2 UE1P-CSCF 1S-CSCF 1 I-CSCF 2 S-CSCF 2 P-CSCF 2 UE2 INVITE 100 Trying INVITE 100 Trying INVITE 100 Trying INVITE 100 Trying INVITE 100 Trying INVITE 100 Trying

Packetizer ® Phone is ringing… 3 UE1P-CSCF 1S-CSCF 1 I-CSCF 2 S-CSCF 2 P-CSCF 2 UE2 183 Ringing

Packetizer ® User Answers! 4 UE1P-CSCF 1S-CSCF 1 I-CSCF 2 S-CSCF 2 P-CSCF 2 UE2 200 OK ACK 30 Messages on the wire!

Packetizer ® Oh! Where’s the Video? Believe it or not, after all of this, if the proposed video codec is not supported by the called endpoint, you will hear audio only. Likewise, if the video is supported, but not the audio, you’ll have video only! So, how do we propose a different video codec? 5

Packetizer ® Send More Messages! 6 UE1P-CSCF 1S-CSCF 1 I-CSCF 2 S-CSCF 2 P-CSCF 2 UE2 INVITE 100 Trying INVITE 100 Trying INVITE 100 Trying INVITE 100 Trying INVITE 100 Trying INVITE 100 Trying 200 OK ACK 24 more messages, for a total of 54 messages!!