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mek Beginner
Beginner

failed call VCS X7&X8 (ACK not forwarded)

Hi!

 

I am currently trying to find the reason in the Release / Manuals / Bug search / forums.

Endpoint TC7-1 is calling TC7-2, SIP TLS all the way through.

We noticed an issue when using a combination of X7 and X8 VCS that on an 

endpoint call terminates after 30 seconds.

The SIP-TLS connection establishment works fine, media is also up, but I can see that the ACK to the 200 OK

does not get send out by the VCS-E "X7-1" to the "TC7-1" to the endpoint.

The TC7-2 

 

(all VCS-E on public IPs, endpoints directly registered to them (through NAT))

works:

TC7-1>X7-1(endpoint TC7-1 registered here) >X8(call routing optimisations used)>X7-2 (endpoint TC7-2 registered here)>TC7-2

 

does not work:

TC7-1>X7-1(endpoint TC7-1 registered here) >X8(call routing optimisation used)>X8-1 (endpoint TC7-2 registered here)>TC7-2

 

Any comment on a known issue, config parameter I missed?

The firewall looks ok and also no ALG or other Layer3 modifiers in between.

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