Unique Call-ID not match SIP Channel ID

Asterisk Asterisk Support
1

Hello,

I noticed one strange thing that Unique Call-ID in logs do not match SIP channel ID.
For example:
[Jul 26 14:02:05] DTMF[120824][C-00001ea6]: channel.c:4103 __ast_read: DTMF begin ‘6’ received on SIP/cucm_India_cucm04pn-00001ea2

This is DTMF for the SIP channel “SIP/cucm_cucm04pn-00001ea2” but Call-ID is “C-00001ea6”, differ by 4.
cucm_cucm04pn is the peer(SIP Trunk for connectivity with VoIP Media switch) that we use for multiple calls to asterisk.

Is it normal that these two IDs do not match?

2

Yes, there is no guarantee they will match. A call can involve more than 1 channel.

3

Thanks for the explanation.