Cannot connect a phone number from a Telnyx sub-account. Telnyx is connected to VAPI using an integration API key (not SIP). When attempting to add a phone number from a sub-account to VAPI, a 404 error occurs. This happens because VAPI is connected to the main Telnyx account, not the sub-account. Proposed solution: Similar to Twilio, allow specifying a telnyx_api_key instead of credentialId when adding Telnyx phone numbers. ___ Without this change, Telnyx sub-accounts are unusable in VAPI, despite being a key feature for enterprise setups.
