Trunk showing disconnects and reconnects throughout the day

[rhi_excellence]

Hi all,

Our client recently had a new trunk added into their 3CX system hosted on a Windows Server box. Both trunks on this system are the same provider but with the new one we are seeing constant unregister and register events at inconsistent intervals.

We are using the providers template and have ensured SIP ALG is off and all firewall rules are okay (as I say works fine for the other trunk)

Speaking to the provider they believe the issue may be that the 3CX system appears to be sending 2 register requests in quick succession both using the same "nonce" value. So although one is going through the correct process (REG/401/REG/200), the other is getting rejected and causing a unregister in the phone system.

I'm not sure why the 3cx appliance is doing this behaviour and wondered if anyone could offer any pointers to fix this?

 

[KyriacosS_3CX]

Hi,

Are they IP based?

 

[paulodagraca]

Hello rhi_excellence,

This information does come from the provider, correct?
Have you been able to get a capture from the 3CX yourself and been able to verify this?

This could sound strange but what the 3CX sends, does not always have to be exactly what the provider does receive.
Multiple Routers, Firewalls and proxy devices can and will be in the loop.

Meaning it would be good to check it from both ways.

Paulo