How to fix this??

[huynhthi870]

Hello all,

could you please be so kind and let me know why one of my remote extensions connects to 3CX PBX and after some time (5 minutes or less) it appears to be disconected in the system?
More strange is that if you go to configurations menu of that router you can see a message saying it is connected and the router external 'voice' light is turn on.
Calls can be made, but not received because PBX thinks that extension is offline.

I am using one Speetouch 780 WL with voip adsl modem/router

Some help will be apreciated

 

[eddv123]

I would take an estimated guess that it maybe related to either SIP ALG being turned on still on the firewall or possible registration expiry for some reason.

 

[YiannisH_3CX]

Hello @huynhthi870

You mentioned that this happens to only one remote extension. Do you have other remote extensions that do not have this issue? Are there more remote extensions behind the same router or are the other extensions in different locations?
Also what kind of remote extension is this? Is it an IP phone or a 3CX client?
If an IP phone how is it provisioned? Are you using remote STUN or an SBC?
The more details you can provider regarding the configuration and the issue the more likely is that we will able to help.