> For the complete documentation index, see [llms.txt](https://help.mypipeline.co.in/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.mypipeline.co.in/twilio/understanding-twilio-numbers.md).

# Understanding Twilio Numbers

Below is an overview of how MyPipeline selects which Twilio Outbound Number to use for a contact, according to various scenarios:

* If the contact is assigned to a user, and the assigned user **has** an inbound Twilio number selected, MyPipeline will always default to the inbound Twilio number.
* If the contact is assigned to a user, and the assigned user **does not have** an inbound Twilio number, MyPipeline will use the Default outbound number selected.
* If the contact is not assigned, MyPipeline will use Default outbound. 
* If the contact will be contacted again, MyPipeline will default to whatever number was previously used to contact them. This rule applies unless they have since been assigned to a user and the user has a different inbound Twilio selected.