Issue with CUCM & call forward to PSTN - content of Diversion header
Description of the callflow :
PSTN (066222222) calls CUCM (055711711) -> internal line number 711711. line 711711 has a CallFwdAll configured to PSTN (047411111) line 711711 has an External Phone Number Mask configured 055711711
On the Cisco Cube to the CUCM Sent: INVITE sip:email@example.com SIP/2.0 Via: SIP/2.0/UDP 172.16.36.11:5060;branch=z9hG4bK1101F013D2 From: <sip:firstname.lastname@example.org>;tag=F2211D5E-1699 To: <sip:email@example.com> P-Asserted-Identity: <sip:firstname.lastname@example.org>
From the CUCM to the Cisco Cube Received: INVITE sip:email@example.com:5060 SIP/2.0 From: <sip:firstname.lastname@example.org>;tag=572691~5b05ad4d-fea7-417e-b8a9-04dd596f3b5b-41332605 To: <sip:email@example.com> Diversion: "test" <sip:firstname.lastname@example.org>;reason=unconditional;privacy=off;screen=yes P-Asserted-Identity: <sip:email@example.com>
We see that the CUCM sends the internal phone number in the diversion Header.
There is no setting that causes CUCM to use the EPNM in the Diversion header so the complexity will be roughly the same whether you do it on CUBE or CUCM.
Based on the example you provide below, a calling transform matching 711711 and prefixing 055 should work. That assumes it’s in a dedicated Partition and CSS, assigned to the SIP trunk, “use device pool css” is not checked, and the trunk has been reset.
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