Channels the number supports; subset of ["sms", "call", "imessage"].
iMessage display first name; always null on numbers without iMessage.
System prompt the AI voice agent uses on inbound calls; null for legacy numbers.
BCP-47 language tag pinning inbound calls to one language; null → detected from the caller's country prefix on each call.
Voice gender for inbound calls ("male"/"female"); null → female (the default).
iMessage display last name; always null on numbers without iMessage.
Per-number call-length cap in seconds; null → no cap at this level.
Human-readable label for the number; null when unset.
Human-readable reason when setupStatus is failed; null otherwise.
Whether the number is ready to use. SMS/call numbers are always ready;
iMessage numbers may be provisioning until set up, or failed on error.
Dial-hosted URL of the number's iMessage avatar photo; null when unset or not an iMessage number.