Understanding Prack and 183 session progress.

[videoconfrencing1944]

I want to understand when a PRACK is sent. What is 183 session progress.Can anyone plse help me understand with help of a scenario.

Thank u in advance

[Manish Gogna]

Here is a good link

https://www.dialogic.com/webhelp/IMG1010/10.5.3/WebHelp/description/sip/sip_prack.htm

However, RFC provides all the details

http://www.ietf.org/rfc/rfc3262.txt

HTH

Manish

[videoconfrencing1944]

Hi Manish,

Thank you for responding. I went through the link. Can you please give me a scenario and explain.

Eg Phone A -----> Calls ---> Phone B and there is a proxy in between them.

When will a prack be sent, what will Phone A hear.. when he dials in.

Thank you.