I'm testing integration with MS Teams. I treat calls from Teams to the phone system the same way as calls from phones. And would like to ask if someone has already dealt with this.

My test account location is set to the United States. When I make a call to "200", an INVITE request from Teams to Kamailio will have "+1200" in the To URI user. I could just strip "+1" but when I make a call to "100", Teams sends "+100". So in this case I need to strip only one character.

The problem is that I don't know when I need to remove one or two characters. And it gets more complicated when I change my test account location. For some countries, Teams prepend 3 characters.

What do to make sure phone numbers are consistent? I thought this behavior could be disabled in Teams but could not find anything related yet.

Thank you!

Regards, Volodymyr Ivanets