Telnyx

The X-Telnyx-Token header distinguishes multiple SIP connections sharing the same IP address.

Token requirements

Requirement	Value
Characters	Alphanumeric (a-z, A-Z, 0-9) and hyphens
Length	12-48 characters
Scope	Globally unique across all Telnyx connections

X-Telnyx-Token: your-token-value

Include this header in all outbound SIP INVITE requests.

{
  "outbound": {
    "outbound_voice_profile_id": "uuid",
    "ip_authentication_token": "your-token-value"
  }
}

Condition	Result
IP matches + token matches	Authenticated
IP matches + token missing/incorrect	Rejected
IP mismatch + token matches	Rejected

Both the source IP and X-Telnyx-Token value must match the connection configuration.

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