Create a SIP Trunk

POST

accounts

{account_id}

telephony

sip-trunks

Create a SIP Trunk

curl --request POST \
  --url https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "sip_cidr": [
    "<string>"
  ],
  "rtp_cidr": [
    "<string>"
  ],
  "name": "<string>",
  "encrypted": true,
  "inbound": {
    "sip_auth": {
      "username": "<string>",
      "password": "<string>"
    },
    "sip_token_auth": {
      "token": "<string>"
    }
  },
  "outbound": {
    "sip_addresses": [
      "sip:my-sbc.example.com:5060",
      "sip:my-sbc.example.com:5061;transport=tls"
    ],
    "default_caller_id": "<string>"
  }
}
'

import requests

url = "https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks"

payload = {
    "sip_cidr": ["<string>"],
    "rtp_cidr": ["<string>"],
    "name": "<string>",
    "encrypted": True,
    "inbound": {
        "sip_auth": {
            "username": "<string>",
            "password": "<string>"
        },
        "sip_token_auth": { "token": "<string>" }
    },
    "outbound": {
        "sip_addresses": ["sip:my-sbc.example.com:5060", "sip:my-sbc.example.com:5061;transport=tls"],
        "default_caller_id": "<string>"
    }
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    sip_cidr: ['<string>'],
    rtp_cidr: ['<string>'],
    name: '<string>',
    encrypted: true,
    inbound: {
      sip_auth: {username: '<string>', password: '<string>'},
      sip_token_auth: {token: '<string>'}
    },
    outbound: {
      sip_addresses: ['sip:my-sbc.example.com:5060', 'sip:my-sbc.example.com:5061;transport=tls'],
      default_caller_id: '<string>'
    }
  })
};

fetch('https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'sip_cidr' => [
        '<string>'
    ],
    'rtp_cidr' => [
        '<string>'
    ],
    'name' => '<string>',
    'encrypted' => true,
    'inbound' => [
        'sip_auth' => [
                'username' => '<string>',
                'password' => '<string>'
        ],
        'sip_token_auth' => [
                'token' => '<string>'
        ]
    ],
    'outbound' => [
        'sip_addresses' => [
                'sip:my-sbc.example.com:5060',
                'sip:my-sbc.example.com:5061;transport=tls'
        ],
        'default_caller_id' => '<string>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks"

	payload := strings.NewReader("{\n  \"sip_cidr\": [\n    \"<string>\"\n  ],\n  \"rtp_cidr\": [\n    \"<string>\"\n  ],\n  \"name\": \"<string>\",\n  \"encrypted\": true,\n  \"inbound\": {\n    \"sip_auth\": {\n      \"username\": \"<string>\",\n      \"password\": \"<string>\"\n    },\n    \"sip_token_auth\": {\n      \"token\": \"<string>\"\n    }\n  },\n  \"outbound\": {\n    \"sip_addresses\": [\n      \"sip:my-sbc.example.com:5060\",\n      \"sip:my-sbc.example.com:5061;transport=tls\"\n    ],\n    \"default_caller_id\": \"<string>\"\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"sip_cidr\": [\n    \"<string>\"\n  ],\n  \"rtp_cidr\": [\n    \"<string>\"\n  ],\n  \"name\": \"<string>\",\n  \"encrypted\": true,\n  \"inbound\": {\n    \"sip_auth\": {\n      \"username\": \"<string>\",\n      \"password\": \"<string>\"\n    },\n    \"sip_token_auth\": {\n      \"token\": \"<string>\"\n    }\n  },\n  \"outbound\": {\n    \"sip_addresses\": [\n      \"sip:my-sbc.example.com:5060\",\n      \"sip:my-sbc.example.com:5061;transport=tls\"\n    ],\n    \"default_caller_id\": \"<string>\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"sip_cidr\": [\n    \"<string>\"\n  ],\n  \"rtp_cidr\": [\n    \"<string>\"\n  ],\n  \"name\": \"<string>\",\n  \"encrypted\": true,\n  \"inbound\": {\n    \"sip_auth\": {\n      \"username\": \"<string>\",\n      \"password\": \"<string>\"\n    },\n    \"sip_token_auth\": {\n      \"token\": \"<string>\"\n    }\n  },\n  \"outbound\": {\n    \"sip_addresses\": [\n      \"sip:my-sbc.example.com:5060\",\n      \"sip:my-sbc.example.com:5061;transport=tls\"\n    ],\n    \"default_caller_id\": \"<string>\"\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "id": "<string>",
  "account_id": "<string>",
  "sip_cidr": [
    "<string>"
  ],
  "rtp_cidr": [
    "<string>"
  ],
  "name": "<string>",
  "encrypted": true,
  "inbound": {
    "hostname": "<string>",
    "sip_auth": {
      "enabled": true,
      "username": "<string>",
      "realm": "<string>"
    },
    "sip_token_auth": {
      "enabled": true
    },
    "default_route": {
      "agent": {
        "agent_id": "<string>",
        "client_env": "sandbox",
        "variant_id": "<string>"
      }
    }
  },
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "outbound": {
    "sip_addresses": [
      "sip:my-sbc.example.com:5060",
      "sip:my-sbc.example.com:5061;transport=tls"
    ],
    "default_caller_id": "<string>"
  }
}

{
  "success": true,
  "error": "<string>",
  "message": "<string>"
}

{
  "success": true,
  "error": "<string>",
  "message": "<string>"
}

{
  "success": true,
  "error": "<string>",
  "message": "<string>"
}

{
  "success": true,
  "error": "<string>",
  "message": "<string>"
}

Inbound authentication

A trunk may use one inbound authentication scheme, or none. The two schemes are mutually exclusive, and are set through the inbound object.

Scheme	Configure with	How callers authenticate
SIP digest	`inbound.sip_auth = { username, password }`	PolyAI issues a standard SIP digest challenge to the first `INVITE`.
SIP token	`inbound.sip_token_auth = { token }`	The caller sends the token in an `X-PolyAI-SIP-Trunk-Token` header.

See Connecting to PolyAI Telephony for how callers present these on inbound calls.

Default route

A trunk’s default route is the agent that receives inbound calls whose dialed number has no extension on the trunk. Use it when many numbers on a trunk should reach the same agent, rather than creating an extension for each one.

An extension always takes precedence: a number with its own extension goes to that extension’s agent.
Without a default route, a call to a number with no extension is rejected.
The default route applies only to its own trunk.

Set it with the optional inbound.default_route:

"inbound": {
  "default_route": { "agent": { "agent_id": "my-agent", "client_env": "live" } }
}

To change or remove it later, see Update a SIP Trunk.

Authorizations

X-API-Key

string

header

required

Path Parameters

account_id

string

required

ID of the account that owns the SIP Trunk.

Body

application/json

The owning account is taken from the URL path, not the body.

sip_cidr

string[]

required

The IPv4 CIDR blocks of your SIP servers.

Required array length: 1 - 10 elements

Maximum string length: 43

rtp_cidr

string[]

required

The IPv4 CIDR blocks of your RTP / media servers.

Required array length: 1 - 10 elements

Maximum string length: 43

name

string

required

A friendly name to help identify your SIP Trunk.

Required string length: 1 - 255

Pattern: \S

encrypted

boolean

Whether this SIP Trunk will handle encrypted (true; SIP over TCP/TLS, media over UDP/SRTP) or unencrypted (false; SIP over UDP, media over UDP/RTP) calls. Defaults to true when omitted.

inbound

object

Configuration for inbound calls. sip_auth and sip_token_auth are mutually exclusive.

Show child attributes

outbound

object

Configuration for outbound calls leaving PolyAI.

Show child attributes

Response

The created SIP Trunk.

A SIP Trunk.

string

required

PolyAI-generated SIP Trunk ID, e.g. tr-0123456789abcdefghijklmn.

account_id

string

required

The PolyAI account that owns the SIP Trunk.

sip_cidr

string[]

required

The IPv4 CIDR blocks of your SIP servers.

rtp_cidr

string[]

required

The IPv4 CIDR blocks of your RTP / media servers.

name

string

required

A friendly name to help identify your SIP Trunk.

encrypted

boolean

required

Whether this SIP Trunk will handle encrypted (true; SIP over TCP/TLS, media over UDP/SRTP) or unencrypted (false; SIP over UDP, media over UDP/RTP) calls.

inbound

object

required

Configuration for inbound calls.

Show child attributes

created_at

string<date-time>

required

RFC 3339 timestamp of when the SIP Trunk was created.

updated_at

string<date-time>

required

RFC 3339 timestamp of when the SIP Trunk was last updated.

outbound

object

Configuration for outbound calls leaving PolyAI.

Show child attributes

Last modified on September 25, 2026

⌘I

Create a SIP Trunk

curl --request POST \
  --url https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "sip_cidr": [
    "<string>"
  ],
  "rtp_cidr": [
    "<string>"
  ],
  "name": "<string>",
  "encrypted": true,
  "inbound": {
    "sip_auth": {
      "username": "<string>",
      "password": "<string>"
    },
    "sip_token_auth": {
      "token": "<string>"
    }
  },
  "outbound": {
    "sip_addresses": [
      "sip:my-sbc.example.com:5060",
      "sip:my-sbc.example.com:5061;transport=tls"
    ],
    "default_caller_id": "<string>"
  }
}
'

import requests

url = "https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks"

payload = {
    "sip_cidr": ["<string>"],
    "rtp_cidr": ["<string>"],
    "name": "<string>",
    "encrypted": True,
    "inbound": {
        "sip_auth": {
            "username": "<string>",
            "password": "<string>"
        },
        "sip_token_auth": { "token": "<string>" }
    },
    "outbound": {
        "sip_addresses": ["sip:my-sbc.example.com:5060", "sip:my-sbc.example.com:5061;transport=tls"],
        "default_caller_id": "<string>"
    }
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    sip_cidr: ['<string>'],
    rtp_cidr: ['<string>'],
    name: '<string>',
    encrypted: true,
    inbound: {
      sip_auth: {username: '<string>', password: '<string>'},
      sip_token_auth: {token: '<string>'}
    },
    outbound: {
      sip_addresses: ['sip:my-sbc.example.com:5060', 'sip:my-sbc.example.com:5061;transport=tls'],
      default_caller_id: '<string>'
    }
  })
};

fetch('https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'sip_cidr' => [
        '<string>'
    ],
    'rtp_cidr' => [
        '<string>'
    ],
    'name' => '<string>',
    'encrypted' => true,
    'inbound' => [
        'sip_auth' => [
                'username' => '<string>',
                'password' => '<string>'
        ],
        'sip_token_auth' => [
                'token' => '<string>'
        ]
    ],
    'outbound' => [
        'sip_addresses' => [
                'sip:my-sbc.example.com:5060',
                'sip:my-sbc.example.com:5061;transport=tls'
        ],
        'default_caller_id' => '<string>'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks"

	payload := strings.NewReader("{\n  \"sip_cidr\": [\n    \"<string>\"\n  ],\n  \"rtp_cidr\": [\n    \"<string>\"\n  ],\n  \"name\": \"<string>\",\n  \"encrypted\": true,\n  \"inbound\": {\n    \"sip_auth\": {\n      \"username\": \"<string>\",\n      \"password\": \"<string>\"\n    },\n    \"sip_token_auth\": {\n      \"token\": \"<string>\"\n    }\n  },\n  \"outbound\": {\n    \"sip_addresses\": [\n      \"sip:my-sbc.example.com:5060\",\n      \"sip:my-sbc.example.com:5061;transport=tls\"\n    ],\n    \"default_caller_id\": \"<string>\"\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"sip_cidr\": [\n    \"<string>\"\n  ],\n  \"rtp_cidr\": [\n    \"<string>\"\n  ],\n  \"name\": \"<string>\",\n  \"encrypted\": true,\n  \"inbound\": {\n    \"sip_auth\": {\n      \"username\": \"<string>\",\n      \"password\": \"<string>\"\n    },\n    \"sip_token_auth\": {\n      \"token\": \"<string>\"\n    }\n  },\n  \"outbound\": {\n    \"sip_addresses\": [\n      \"sip:my-sbc.example.com:5060\",\n      \"sip:my-sbc.example.com:5061;transport=tls\"\n    ],\n    \"default_caller_id\": \"<string>\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.us.poly.ai/v1/accounts/{account_id}/telephony/sip-trunks")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"sip_cidr\": [\n    \"<string>\"\n  ],\n  \"rtp_cidr\": [\n    \"<string>\"\n  ],\n  \"name\": \"<string>\",\n  \"encrypted\": true,\n  \"inbound\": {\n    \"sip_auth\": {\n      \"username\": \"<string>\",\n      \"password\": \"<string>\"\n    },\n    \"sip_token_auth\": {\n      \"token\": \"<string>\"\n    }\n  },\n  \"outbound\": {\n    \"sip_addresses\": [\n      \"sip:my-sbc.example.com:5060\",\n      \"sip:my-sbc.example.com:5061;transport=tls\"\n    ],\n    \"default_caller_id\": \"<string>\"\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "id": "<string>",
  "account_id": "<string>",
  "sip_cidr": [
    "<string>"
  ],
  "rtp_cidr": [
    "<string>"
  ],
  "name": "<string>",
  "encrypted": true,
  "inbound": {
    "hostname": "<string>",
    "sip_auth": {
      "enabled": true,
      "username": "<string>",
      "realm": "<string>"
    },
    "sip_token_auth": {
      "enabled": true
    },
    "default_route": {
      "agent": {
        "agent_id": "<string>",
        "client_env": "sandbox",
        "variant_id": "<string>"
      }
    }
  },
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z",
  "outbound": {
    "sip_addresses": [
      "sip:my-sbc.example.com:5060",
      "sip:my-sbc.example.com:5061;transport=tls"
    ],
    "default_caller_id": "<string>"
  }
}

{
  "success": true,
  "error": "<string>",
  "message": "<string>"
}

{
  "success": true,
  "error": "<string>",
  "message": "<string>"
}

{
  "success": true,
  "error": "<string>",
  "message": "<string>"
}

{
  "success": true,
  "error": "<string>",
  "message": "<string>"
}

API reference

Build & deploy

Runtime & data

Monitoring

Legacy

Inbound authentication

Default route

Authorizations

Path Parameters

Body

Response

​Inbound authentication

​Default route

Authorizations

Path Parameters

Body

Response

Inbound authentication

Default route