Solved 3CX does not respond to SIP Invites after last Update

[Lev]

SOLVED:

Last night i updated to the latest Version.
But now, when i call out, there is NO Audio.
All incomming calls are redirected to my Trunk-Backup Number.

After asking my Trunk Provider, they told me, that SIP Invites are not answered by the 3CX (hosted, Debian)

Any Ideas?

Edit:
Thanks to the great support on the Forums, we found out, that it was an DNS Problem.
Some sort of IPv4 vs IPv6 thing...

SOLUTION:
In the Trunk settings the outbound Proxy must be set to an IP, not a FQDN.

 

[YiannisH_3CX]

Hello @Lev

Check your ip blacklist, is your providers ip blacklisted for some reason? Also can you pass the firewall check of the PBX? Do you see any issues there?

 

[Lev]

- Blacklist is empty
- Firewall check:

[*]resolving 'stun-eu.3cx.com'... done
[*]resolving 'stun2.3cx.com'... done
[*]resolving 'stun3.3cx.com'... done
[*]resolving 'sip-alg-detector.3cx.com'... done
[*]testing 3CX SIP Server... done
[*]stopping service... done
[*]detecting SIP ALG... not detected
[*]testing port 5060... done
[*]starting service... done
[*]testing 3CX Tunneling Proxy... done
[*]stopping service... done
[*]testing port 5090... done
[*]starting service... done
[*]testing 3CX Media Server... done
[*]stopping service... done
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[*]starting service... done

 

[YiannisH_3CX]

Is your provider register based or IP based? Also is your provider a supported one?

 

[Lev]

- Provider is supported - Deutsche Telefon Standard AG
- Register based

The Registration looks good

 

[YiannisH_3CX]

We have a Deutsche Telefon test account registered on SP2 and everything looks good. Inbound and outbound calls work great.
can you run a wireshark capture from the management console and send it to me in a p.m so i can take a look? Try an inbound and an outbound call if you can

 

[Lev]

Sorry, but where can i add an attachment?

 

[YiannisH_3CX]

You have to upload it to a web sharing service like Dropbox or WeTransfer and send me the download link

 

[Lev]

ok, i uploaded it to an ftp

 

[Lev]

The Issue was addressed by a nice support worker via TeamViewer.
Thanks a log again.

I stated the solution in my first posting.