Problem with calls to cucme

[Andre Bars]

Hello! I'm trying to manage incoming and outgoing calls. I have a sip trunk configured with a provider. There is a sip account to which the provider has linked 10 numbers. Sip account - lgn_201@example.com. When I receive a call to CUCME I see in the logs

Received:
INVITE sip:lgn_201@1.2.3.4:5060 SIP/2.0
Via: SIP/2.0/UDP 5.5.5.5:5060;branch=z9hG4bK65-7ynyhj1msda14
From: "+71111111111" <sip:+711111111111@example.com>;tag=65-26kqmz0qiby50
To: <sip:lgn_201@example.com>
Call-ID: SD8oibc01-10dd7a0f51b6a9bac08fe3e124a36937-aovl7v3040-itlTTbeOt
CSeq: 1 INVITE
Diversion: <sip:+72222222222@example.com>
Contact: <sip:signode-65-8qammc0pzstzb@5.5.5.5:5060;transport=UDP>
Allow: INVITE, ACK, CANCEL, BYE, INFO, REFER, SUBSCRIBE, NOTIFY
Allow-Events: keep-alive
Supported: timer
Session-Expires: 7200
Min SE: 900
Max-Forwards: 60
User-Agent: ITLCS 7.3.3
Content-Type: application/sdp
Content-Length: 406

All incoming and outgoing calls come from under the lgn_201 account. And as I understand it, the manipulation of numbers occurs precisely in the Diversion field. But how to do it correctly?

[Elliot Dierksen]

I have not seen an ITSP send the calls that way. The numeric portion was always in the "To:" header with every ITSP I can recall. Can you request that they send the numeric info in the "To:" header? It is possible to change that using SIP profiles, but that would have a few moving pieces. You would have to capture to the info from the Diversion: header into a variable, remove the To: header, and then re-insert the To: header with the variable captured from the Diversion: header.

[Nithin Eluvathingal]

I've never seen a SIP invite with account details instead of numbers either. Is your ITSP sending you the correct information? SIP technology is still new for many ITSPs.