Extension@CUCM_IP for B2B calls via Expressway-C and E

[VCsupport17]

Hi Community,

I need your expertise and some advises. We have deployed video endpoints and registered to CUCM and have SIP address in 7xxx@CUCM_IP format. We need to dial out video endpoints outside our network as well as receiving calls from external (B2B). We have Expressway-C and E and already configured. SIP trunk between CUCM and Expressway-C is active. Traversal Zone also active for SIP and H323 connections.

Could you guide me what the next procedures on how to enable B2B calling from endpoints registered to CUCM with 7xxx@CUCM_IP addresses to be routed to the SIP trunk going to Expressway-C to E then hitting the endpoints located outside. And also how this external endpoints can reach these endpoints inside the network. How they will dial?

How would the Expressway-C translate the 7xxx@CUCM_IP source to its destination. Do it need to strip the domain portion and replace it with a SIP domain?

Thanks in advance.

[Patrick Sparkman]

Why not dial using a domain instead of IP address?  It's highly recommended to dial via a domain, it's also mentioned in the Expressway and CUCM via SIP Trunk Deployment Guide (CUCM 8,9,10,11 and X8.7) on how to setup your CUCM and Expressway for B2B calling.

[VCsupport17]

Hi Partick, thanks for response. 

To give you an overview. 

IP address of CUCM = 10.10.1.100

Video endpoint address registered on CUCM = 7001@10.10.1.100

Expressway-C configured domain = company.com

Internal calls works fine. Endpoints just dial extension 7xxx without domain portion.

If i will call external endpoint and should go via Expressways, the domain portion which is the CUCM IP address should be converted to a SIP domain configured on Expressway-C right? So the 7001@10.10.1.100 will become 7001@company.com as source address. Then if the external endpoint can call me back using same address.

I think on the guide you provide under page 19 "Creating a Transform that Converts number@ to number@exp.domain" is the procedure i will take.

Please advise.

Thanks.

[Nikhil Jayan Kandampully]

Hi,

It's possible to configure domain for CUCM as well so your source address will display number@domain instead of IP Address.

Please create a sip route pattern in your CUCM for domain routing and point to the trunk to Exp-C. This will help you to route the SIP URI call to Exp-C and internet.

Pattern format: *.*.* and *.*

Ensure you have vcs-interop script configured on your SIP Trunk to EXP-C.

BR,

Nikhil Jayan