What Header in the SIP INVITE Method is used by Cisco CUCM to route a call?

[Meddane]

What Header in the SIP INVITE Method is used by Cisco CUCM to route a call with a called number in the following format:

1- URI

2-Digit Numbers

[Roger Kallberg]

The Request URI header is used for call routing.

[Meddane · Accepted solution]

I am asking which field in the SIP header INVITE, the cucm uses to route a call.

[Roger Kallberg]

I updated my answer to make it clearer. See this document for details on the various headers. https://transnexus.com/whitepapers/sip-invite-header-fields/