# Transfer to PSTN

When an IVR or call queue is configured to transfer calls to an external number, the number is required to be in E.164 format and the resource account assigned to the queue or IVR performing the transfer must have a Teams Phone Resource Account license and one of the following assigned:

For Microsoft provided numbers:

* A [pay-as-you-go](https://learn.microsoft.com/en-us/microsoftteams/calling-plans-for-office-365#pay-as-you-go-calling-plan) license assigned or
* [Communications credits](https://learn.microsoft.com/en-us/microsoftteams/what-are-communications-credits)

For Direct Routing numbers:

* An [online voice routing policy](https://learn.microsoft.com/en-us/microsoftteams/manage-voice-routing-policies).
  * Phone number assignment is optional when using Direct Routing.

There are no additional requirements when an [Operator Connect](https://learn.microsoft.com/en-us/microsoftteams/operator-connect-plan) phone number is assigned.


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