January 22, 2026 | Synthflow

Phone Numbers API enhancements

New endpoints have been added and existing endpoints have been updated for managing phone numbers.

New endpoints:

Endpoint	Title
GET /numbers/{phone_number_slug}	Get a phone number
POST /custom-numbers	Import phone number
PATCH /numbers/{phone_number_slug}	Update a phone number
DELETE /numbers/{phone_number_slug}	Delete a phone number

Get a phone number: Retrieve detailed information about a specific phone number, including SIP configuration, capabilities, and attached assistants.
Import phone number: Import custom phone numbers for direct SIP dialing scenarios.
Update a phone number: Modify phone number configuration including friendly name and SIP settings.
Delete a phone number: Remove a phone number from your workspace. For purchased phone numbers, this also cancels the monthly subscription.

Updated endpoints:

Endpoint	Title
GET /numbers	List phone numbers

List phone numbers: Now includes pagination information (total_records, limit, offset) in the response.