E21xxx — Voice & SIP trunking
Error codes in the E21xxx range that the public Bird API returns. Each code links to its own page (the page its doc_url points at) with the cause and what to do. Retired codes stay listed; they are never renamed or reused.
| Code | Name | Status | Message |
|---|---|---|---|
| E21006 | — | — | Retired: no longer returned, never reused. |
| E21008 | — | — | Retired: no longer returned, never reused. |
| E21048 | VoiceInboundNumberAlreadyClaimed | 409 | Another SIP trunk already answers this inbound number. |
Related
- Errors: the full wire contract, status mapping, and all code ranges
- Error handling: branching on type and code, validation details, and vendor_code