Inbound and outbound calls delayed

[Dupablada]

I seem to be having some trouble with our phones and 3cx. We are using Yealink T23G's. If we try to make a call it can take about 10 to 20 seconds for the call to initialise with the 3cx server and when calls come in the same thing happens they hit the server, but then there is a delay of about 5-10 seconds or so before the phones start ringing. When incoming calls come into the phone system the 3CX app on my mobile rings straight away, but if I try answer it nothing happens until the T23G's start rising.

Other than that audio is fine both ways. We used to have the phones running over secure VPN between out office and the data centre where our 3cx server is working and this was not an issue then, but we had some issues with the VPN dropping off and this would cause call drop outs so we decided to try remote provisioning.

If anyone has any thoughts on this that would be greatly appreciated.

 

[nub]

primary dns timeout? odd that it has a delay then works ok. dns is all i can think of.

 

[leejor]

Have a look over the 3CX Activity Log of the calls. It will show how long it takes for 3CX to handle" it's part". Until it receives an Invite, it can't process the call, so if 3CX shows no internal delay, then it is something external. If it a delay in placing calls from the set, there may be an issue with the sets dialplan, or delay before sending digits, as it waits for all to be dialled. If it is incoming from your provider, then they may be able to assist in determining why...are they sending to the correct IP, initially?

 

[saint_]

Calls locally to another extension, or calls through the SIP Carrier ?

 

[BrenttG]

We have seen this exact behavior before, With some Sonicwall and Sophos firewalls at the local side where the phones are.

What firewall do you have at the Datacenter, and the local site where the phones are?

 

[ComputerMechanic]

Have the ports been forwarded correctly?

See the article https://www.3cx.com/docs/manual/configuring-ip-phones/#h.ul2fzupi6t22/ scroll down to the STUN setup.

Give each phone a static IP. Allocate SIP and RTP ports for each phone and forward these on the router.

 

[BrenttG]

Have the ports been forwarded correctly?

See the article https://www.3cx.com/docs/manual/configuring-ip-phones/#h.ul2fzupi6t22/ scroll down to the STUN setup.

Give each phone a static IP. Allocate SIP and RTP ports for each phone and forward these on the router.

If this was the case, he would be having no audio/no call issues, etc, the delay is a seperate issue.