3cx Hosted Inbound Calls Getting Request Timeout

[mprythero]

Hello!

I have our instance hosted with 3cx and our provider Voxtelesys asked us to check the firewall as they were getting request timeouts from inbound calls on the trunk. But this is hosted, so I am not sure what we can do. The trunk integration under Voice is showing as green and under the new analysis function I get the following:

Trunk Analysis
Main trunk number '+19707538870'
Registrar '3cx.pstn.voxtelesys.net' has a DNS NAPTR record resolving to:

• _sip._udp.3cx.pstn.voxtelesys.net o=10
• _sip._tcp.3cx.pstn.voxtelesys.net o=20
• _sips._tcp.3cx.pstn.voxtelesys.net o=30

Registrar '3cx.pstn.voxtelesys.net' has a DNS SRV record '_sip._udp.3cx.pstn.voxtelesys.net' resolving to:

• 3cx.pstn.dfw01.voxtelesys.net:5060 p=10
• 3cx.pstn.slc01.voxtelesys.net:5060 p=10

Registrar '3cx.pstn.voxtelesys.net' has a DNS HOST record (3cx.pstn.dfw01.voxtelesys.net) resolving to: [23.155.18.55]
Registrar '3cx.pstn.voxtelesys.net' has a DNS HOST record (3cx.pstn.slc01.voxtelesys.net) resolving to: [23.155.17.55]
IP Mode: IPv4
Selected server address: 23.155.18.55:5060
Selected transport type: UDP
Selected server domain: 3cx.pstn.dfw01.voxtelesys.net
The SIP Registration is Successful since 11/12/2025 1:11 PM

Inbound Call Test
Local Codec: [PCMU, PCMA, G729]
Detected Issues

The Inbound Call failed.

I would be grateful for any assistance that could be provided.

 

[TylerD-Voxtelesys]

Hi mprythero,

It looks like you currently have an active ticket with us. We provided an update in the ticket. Please review our response in the ticket.