3CX inbound and outbound errors from LAN

[Tony Liddell]

Hi all,
Just hoping you can help me here. I have a 3CX system running via a wee server in the office. It was running fine until the end of last year when everything went wrong.
I'm running the up to date version of the software with a Yealink T23G phone.
I'm having a number of errors:
1. Incoming mobile calls continue to ring on the mobile end after I've answered the call;
2. Incoming landline calls appear to hear me pick up, but can't hear a voice;
3. External landline calls can hear me speak but I can't hear them.
4. Answer phone permanatelty unavailable.

The tech guys that set the system up for me have checked the ports and firewalls and all ok.

Error messages include:

1. ACK is not received from sip:#########@##.###.#.##
2. Call to <sip:[email protected]:5060> has failed; Cause: 408 Request Timeout/INVITE from local

Any thoughts?

Cheers

Tony

 

[eddv123]

Firstly, where are all your extensions in regards to 3CX - local or via STUN SBC VPN to a remote site ? In regard to the firewall itself, what brand do you have ? and does the firewall checker pass ?

In regards to some of your issues they could be firewall/port forwarding/SIP ALG related, but some (like answer phone unavailable) are probably not.

Your ACK error I have not seen recently (there are some forum posts historically for this issue which is why I best ask what version of 3CX you are running. The ACK issue could also be related to a port closing issue, for this check the keep-alive setting: https://www.3cx.com/community/threads/keepalive.15706/