Teams Voicemail removes a digit from the callback number for 570 area code

GoldenKen We have not yet resolved, but we might be close.  Microsoft believes the reason it is happening is because our SIP provider is stripping the country code from incoming calls.  The case is currently open with our SIP provider.

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After looking into this with our internal team. When they tested Globally for 570 area code number, we received correct incoming calls for most of tenants results with correct number formatting which is +1570.

And for our your tenant we see its coming as +570 which is incorrect, we strongly suspect that this has to be corrected from your end, and because of this When the input was +570702139 team client assumed +57 is the country code (Columbia) as there is no country code for +570. So, it divided the number into two parts +57 02139 (dropping zero and seven).

But if we add a 1 after the plus sign, it looks fine. So it is uncommon to have +57 number (without country code). This must be checked thoroughly from your end.

Please can you connect with your vendor to thoroughly check this is there is any incoming stripping. 

Number formatting, with 1 after +

Number formatting without 1 after +