List Fax Phone Numbers
Fax lines available as the “From” number in the compose form.
Fax-permissioned twin of the settings GET /admin/phone-numbers?type=FAX
endpoint. That one is gated by AI-assistant read, so a fax-only user 403s
there and the compose form wrongly renders “No fax line configured.”
Declared above GET /faxes/{fax_id} on purpose — same declaration-order
hazard the unread-count route above documents, else {fax_id} would
swallow phone-numbers and 404.
Returns a sparse PhoneNumberSummary (assistant/ring-group fields left at
their schema defaults) so a fax-only role can’t enumerate the tenant’s
voice/assistant topology through this endpoint.
Headers
The tenant you are making this request on behalf of
Your api key
Response
Successful Response
Which SignalWire resource is bound to the DID's calling handler.
SignalWire exposes one calling handler slot per DID, so a single number
is either a voice line or a fax line — not both. SMS lives on a separate
messaging handler and is bound in both cases.
CALL, FAX 