Solved 3CX replying with a 403 message back to TelNyx

[stsvoip]

Any help would be extremely helpful

2019/08/12 16:14:47.226838 69.63.172.81:5060 -> 192.76.120.10:5060
SIP/2.0 403 Forbidden
Via: SIP/2.0/UDP 192.76.120.10;branch=z9hG4bKf2fa.ec7e697d3b1fb68d871b3930fffbe0cf.0
Via: SIP/2.0/UDP 10.15.35.4:6000;received=10.15.35.4;rport=6000;branch=z9hG4bKX44XrrtZHDcXe
To: <sip:[email protected]:5060>;tag=3011e747
From: "13122708243"<sip:[email protected]>;tag=97p7eX3NBHcvj
Call-ID: c91d5398-9800-4763-bc2b-ea93b6473288
CSeq: 8259451 INVITE
User-Agent: 3CXPhoneSystem 16.0.2.910 (910)
Warning: 499 STSPBX04 "Caller is not identified"
Content-Length: 0

 

[cobaltit]

Is this a new 3CX installation or was this previously working?

 

[stsvoip]

Its with a new SIP Trunk. Here is what I get when I run the firewall checker...

 

[cobaltit]

So you'll want to resolve the firewall checker issues first. See if your firewall is listed here for instructions:

https://www.3cx.com/support/firewall-configuration/

 

[YiannisH_3CX]

As mentioned you will need to make sure you pass the firewall checker to eliminate any issues there. Also make sure that you have used the default template to setup the trunk.
https://www.3cx.com/docs/telnyx-voip-provider/

 

[stsvoip]

I was able t resolve the firewall issues, but it still didn't fix my problem. Here is how I resolved...

The inbound call triggered a match between two trunks Telnyx LLC and VI Inbound. Due to the call not having a single defined route the call cannot be handled and is rejected with the 403. Basically, the DID was setup in two trunks. I removed it from one trunk and confirmed it worked without issue.

 

[YiannisH_3CX]

Glad to see the issue has been resolved and thank you for updating the thread with your solution.