Call2Teams - Customers
Checking the Registration Status of users from the Users tab of the service portal, as shown in the screenshot below:
Next to each user in the list is a status light indicator.
If the status light is green, then the service can access the user's PBX/Trunk details.
Hover the cursor over the status light indicator to see a tooltip with more information.
Diagnostics: Registration Issues
Check that the user's SIP username/password/domain matches a user on the PBX.
Ensure that the Call2Teams IP addresses are not being blocked by a firewall (see this article for more advice).
Check that the proxy port default of 5050/5061 isn't being rejected by the PBX.
Set the SIP Proxy so it includes the preferred port.
Ensure that the SIP REGISTER contact header received by the customer's PBX isn't too long.
Try the following setting on the service portal, shown in the screenshot below: