Frequent disconnection from SIP Trunk [Cause: Cause: 408 Request Timeout/REGISTER from local]

[Zisis]

For the last few days i have been getting frequent disconnections of the SIP trunk resulting in calls being dropped and delay to come back.

I use 3cx hosted instance with a supported SIP provider, Modulus in Greece. I have already contacted them and they cannot see any issues from their end. I enabled verbose logging and i can see it fails with

Registration failed for: Lc:10001(@modulus-Main[<sip:[email protected]:0/UDP>]); Cause: Cause: 408 Request Timeout/REGISTER from local
and the email i receive from 3CX is
Registration at modulus-Main has failed.

Destination (sip:185.73.43.250:5060;lr) is not reachable, DNS error resolving FQDN, or service is not available.

I have been constantly pinging the the voips.modulus.gr (which resolves to the above IP) i haven't received a single timeout during the time the SIP was down so I would exclude problem from the provider's side or DNS error.

After the that it seems to take 2 minutes to try again so we are practically left each times with 2 minutes out of service in addition to the dropped calls.

Any ideas what to look for next?

 

[bitn2]

What dns is your 3cx using?

 

[AWS2P]

What dns is your 3cx using?

OP said :" I use 3cx hosted instance " so DNS is not in their hands but 3CX ,no ?

 

[Zisis]

Exactly, it is hosted by 3CX so nothing network related i can touch there. The SIP trunk is setup with FQDN voips.modulus.gr however when the issue occurs the FQDN still resolves without an issue.

 

[TheodorosG_3CX]

Have you also contact with the provider to clarify if there is any issue from their side?

 

[Zisis]

As i mentioned on the original post, I did and they couldn't see a problem, nor anyone else had complained for the same issue.

 

[TheodorosG_3CX]

Is it possible to create a support ticket so we can check this further?
You may contact with your partner first.

 

[Zisis]

I will need to purchase a support ticket first if I am not mistaken, correct?

 

[TheodorosG_3CX]

You may contact your partner first and if is is required they can open a ticket to the support.