Hi @Gurudas
Here is a link about this topic: External phone number transfers - technical details
Refer to the Prerequisites in order to allow auto attendants to transfer calls externally. In addition:
- For a resource account with a Calling Plan license or Operator Connect number, the external transfer phone number must be entered in E.164 format (+[country code][area code][phone number]).
- For a resource account with a Microsoft Teams Phone License and Direct Routing online voice routing policy, the external transfer phone number format is dependant on the Session Border Controller (SBC) settings.
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