10-13-2012 05:20 AM - edited 03-16-2019 01:40 PM
10-13-2012 07:09 AM
In a nutshell signaling from/to call agent (i.e. CUCM or CME) establishes the call between the 2 phones and RTP packets (voice stream) flows between the phones directly. Call agent is in charge of the call tracking the state, etc.
For more details it depends on protocol being used i.e. SIP, SCCP, etc. Here is similar thread:
https://supportforums.cisco.com/message/3544970#3544970
HTH, please rate all useful posts!
Chris
10-13-2012 09:50 PM
Thanks for your reply
Can you explain me what are the signallings(consider SCCP) involved and how the media path is established between two IP phones under same device pool.
Does the phones communicate through the same RTP port?
10-14-2012 09:14 AM
Signaling is between phones and call agent, the link I provided has a link to doc that shows ladder diagram for ATA, but the concept is the same for phones:
The RTP is established on negoriated UDP port, so yes all packets for the stream go through the same port.
HTH,
Chris
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