B2B call using SX20 from Internet to an Enterprise that have Expressway-E

[iantra123]

Hi,

There are two independant company that wish to make Videoconference.

The first, companyA, has only a SX20 (H323 direct call like using Polycom hdx or realgroup), and have internet connexion.

The second, companyB, have a full UC with Expressway-E&C + CUCM + TPS + conductor + RMS licenses.

We want that the companyA make call to a CMR on the CompanyB.

How to do, is there any document that can help.

regards,

Antra

[Patrick Sparkman]

All Cisco endpoints, and most other manufacture's endpoints these days can or should be able to make URI calls using the format "alias@domain", refer to Appendix 2 of the Expressway Basic Configuration Deployment Guide (X8.9) on required DNS SRV records for B2B calls. 

I assume you're CUCM and Expressway-C/E is configured correct, but just in case refer to the Expressway and CUCM via SIP Trunk Deployment Guide (CUCM 8,9,10,11 and X8.8).

[Joe Vallender · Accepted solution]

If the SRV records haven't been set up yet for a domain pointing to the Expressway E or the calling endpoint doesn't have a DNS server available for domain resolution, you may be able to use the IP address of the Expressway E instead of the domain, e.g. alias@ExpE_ipaddress.

[Patrick Sparkman · Accepted solution]

In addition to Joe's comment, If external endpoints dial alias@Experssway_IP, a transform will need to be used on the Expressway-E to convert the IP into your SIP domain.

Configuration > Dial plan > Transforms

• Pattern type: Suffix
• Pattern string: %ip%
• Pattern behavior: Replace
• Replace string: (your SIP domain)

%ip% will match any IPv4 address configured on the server without needing to specify a specific IP address, it will match all.