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Beginner

Calling CMS room from external SfB client

Dear Colleagues,

We have a fully functioning UC infrastructure with Expressway-Core/Edge and CMS and I would like to enable incoming SfB calls to CMS room.

What do we have:
- Public certificate on Edge
- Turn server on Edge
- Traversal zone between Core and Edge
    TLS enabled
    Do not check credentials
- Neighbor zone between Core and CMS
    TLS enabled
    Do not check credentials
- Search rule on Edge
    Protocol: SIP (All variants)
    Source: Default
    Regex pattern: room@domain.com.*
    Target: Traversal zone
- Search rule on Core
    Protocol: SIP (All variants)
    Source: Traversal zone
    Regex pattern: room@domain.com.*
    Target: CMS
- Incoming call handling on CMS
    Domain: domain.com
    Target spaces: yes
- Space on CMS
    Name: room
    URI part: room
- TURN settings on CMS
    TURN server address: Edge internal
    Proper username/psw
    
During the test I experienced that I was able to call the CMS room from Cisco devices and Spark only, but not from SfB.
From the TCP dump of Edge external interface I saw that during SfB attempts, there are TCP packets only, no UDP at all.

Is there anything I missed?

Thanks,
Laszlo

1 ACCEPTED SOLUTION

Accepted Solutions

Re: Calling CMS room from external SfB client

Do you see a search request on your Expressway-E coming from SFB?

Have you checked firewall?

And can I confirm this is for external SfB participants from other organizations?


I rolled something like this out recently and I didn't need to set anything special up, other than the _sipfederationtls SRV records pointing to Expressway-E.

 

Expressway-E directed inbound calls to CMS regardless of the SIP variant, so long as the right URI was dialled. 

 

I know that SfB *can* be a bit funny about DNS records and SIP domains, in my case the Exp-E's hostname was vc.domain.com, which was also our SIP domain.

 

View solution in original post

2 REPLIES 2

Re: Calling CMS room from external SfB client

Do you see a search request on your Expressway-E coming from SFB?

Have you checked firewall?

And can I confirm this is for external SfB participants from other organizations?


I rolled something like this out recently and I didn't need to set anything special up, other than the _sipfederationtls SRV records pointing to Expressway-E.

 

Expressway-E directed inbound calls to CMS regardless of the SIP variant, so long as the right URI was dialled. 

 

I know that SfB *can* be a bit funny about DNS records and SIP domains, in my case the Exp-E's hostname was vc.domain.com, which was also our SIP domain.

 

View solution in original post

Highlighted
Beginner

Re: Calling CMS room from external SfB client

Hi Nick,

 

You were right, as it turned out, the SfB client was in a restricted network.

The security engineer told me that there is no restrcition regarding the outbound connection, but the logs don't lie :-)

 

Thanks, Laszlo

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