Unable to receive call Gradwell SIP Trunks

[DavidHodgson]

Hi,

I have just set up a 3CX 16SC V18.1 Standard system running on Azure, deployed using the PBX Express wizard.

Using Gradwell SIP Trunks, configured using the template in 3CX.

Able to dial out without any issues.

Gradwell have issued a temporary number to test inbound but cannot call into the system. From another 3CX system we get 'The call could not be established contact the administrator'. Gradwell support state there is a 500 error when they did a test call and traced it.

I have added all the IP ranges provided by Gradwell into 3CX as I noticed that the system had blocked two of the Gradwell IP addresses.

Can anyone suggest anything, system is going live next Tuesday when the customers number ports.

Thanks

 

[YiannisH_3CX]

Hello @DavidHodgson

Start by checking the activity log of the system. Do you see the calls hitting the PBX? You could also run a packet capture to verify the same thing. That should tell you where the error comes from. If it's coming from the PBX then check the destination of the number and make sure it's available. If not then perhaps the call is being rejected by something else.
Also run the firewall checker and make sure everything passes