Intercom between on-prem 8851 and off-prep MRA 8851

[jairreal8]

Hi all,

My company is trying to configure intercom to work between an on-prem 8851 phone and an off-prep 8851 phone registered through MRA/Expressways. 

The off-prep MRA 8851 is able to successfully intercom to the on-prem 8851 and two-way audio is possible once the on-prem 8851 accepts the intercom request. However, when the on-prem 8851 tries to intercom to the off-prep MRA 8851, a message is heard immediately saying "this call cannot be completed as dialed" and a 404 not found error is seen in log.

Has anyone been able to make this work or have any ideas to try? 

[Vaijanath Sonvane]

Hi,

As per Cisco Expressway Release Note (X8.11.4), the intercom support is available over MRA for IP Phones that support this feature. I hope you are using Expressway Release X8.11.4 or later. Also, please make sure you have configured correct Partition (including Directory URI Partition) and CSS for Intercom feature. 

[ashok_boin]

It looks like dial plan routing issue.

Pls check through Dialed Number Analyzer service OR you can trace the call flow on RTMT if it's SIP.

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/dna/11_5_1/CUCM_BK_CBA47A6E_00_cucm-dna-guide-115/CUCM_BK_CBA47A6E_00_cucm-dna-guide-115_chapter_011.html#CUCM_TK_C02373E4_00

https://www.cisco.com/c/en/us/support/docs/unified-communications/unified-communications-manager-callmanager/213583-procedure-to-analyse-call-flow-of-sip-ca.html