Solved Teams Integration not working

[group24admin]

Hello all,

i wanted to implement the Teams-Integration for our company, since we've already
used 3CX for a few years now.

I have followed instructions and provided documentations step by step, but the
Integration unfortunately still doesn't work for us. In- and outbound calls are
are working perfectly on our softphones, but they don't get "put through" to Teams.

We're using a hosted 3CX-Solution (v18.0.1.214) with a custom FQDN and SBC in Germany.

We always get the following error:

"Unfortunately we could not connect you. Please try again later."


What we already troubleshooted:

- Ports are open (shouldn't be a problem with hosted 3CX anyways)
- certificates are correct and from a supported authority
- Teams-FQDN and SBC is set up
- M365 synchronization works fine
- Trunk and numbers are online and working
- 3CX (enterprise) and Microsoft Licenses (Business Premium + Business Voice (without calling plan) are correct and working
- AzureAD settings are correct and permissions set correctly
- 3CX-Dial Plans and User-Scripts have been deployed (multiple times) without an error

I'm working on this for a few weeks now and i'm basically running out of ideas, why
this still doesn't work. I might have a small error somewhere that i haven't seen yet.

I'm sorry for this long novel. I would be more than thankful for any further ideas from you guys.

Many thanks!

Best,

Marcus

 

[NickD_3CX]

Hello,

Inbound Calls are still working, but outbound still aren't.

The certificate has been inserted correctly thanks to @StefanW

Our subdomain ist directing to the IP (IP is reachable) he has provided to us:

A-Record:

View attachment 25072


I have waited since Friday, but it still doesn't work. i have once again fully read the FAQ for the DNS Record and everything seems to be fine.

Best,

Marcus

Hi Marcus,

So just to be clear which calls do and don't work:

• 3CX --> Teams: Works
• Teams --> 3CX: Does not work

is this correct?

Also, what do you see here?

 

[group24admin]

Hi Marcus,

So just to be clear which calls do and don't work:

• 3CX --> Teams: Works
• Teams --> 3CX: Does not work

is this correct?

Also, what do you see here?
View attachment 25073

Exactly, only the outbound calls don't work as you can see here:



Here you go:

 

[NickD_3CX]

Exactly, only the outbound calls don't work as you can see here:

View attachment 25076

Here you go:
View attachment 25079

I will send you a PM with some instructions.

 

[NickD_3CX]

To others reading this, the remaining problem was that outbound calls from Teams to External Numbers via a SIP Trunk could not be made.

This was being caused because Teams dial all numbers in e164 format (with the leading '+' symbol)
The remedy was to properly format the dialed number into the format the provider supports accepts (in this case we also had to disable e164 in Settings as well).