Overview
LiveKit has built-in APIs that let you to manage SIP trunks, dispatch rules, and SIP participants. The SIP API is available with LiveKit server SDKs and CLI:
important
Requests to the SIP API require the SIP admin permission unless otherwise noted. To create a token with the appropriate grant, see SIP grant.
To learn more about additional APIs, see Server APIs.
Using endpoints
The SIP API is accessible via /twirp/livekit.SIP/<MethodName>. For example, if you're using LiveKit Cloud the following URL is for the CreateSIPInboundTrunk API endpoint:
https://<your LiveKit URL domain>/twirp/livekit.SIP/CreateSIPInboundTrunk
Authorization header
All endpoints require a signed access token. This token should be set via HTTP header:
Authorization: Bearer <token>
LiveKit server SDKs automatically include the above header.
Post body
Twirp expects an HTTP POST request. The body of the request must be a JSON object (application/json) containing parameters specific to that request. Use an empty {} body for requests that don't require parameters.
Examples
For example, create an inbound trunk using CreateSIPInboundTrunk:
curl -X POST https://<your LiveKit URL domain>/twirp/livekit.SIP/CreateSIPInboundTrunk \-H "Authorization: Bearer <token-with-sip-admin>" \-H 'Content-Type: application/json' \-d '{ "name": "My trunk", "numbers": ["+15105550100"] }'
List inbound trunks using ListSIPInboundTrunk API endpoint to list inbound trunks:
curl -X POST https://<your LiveKit URL domain>/twirp/livekit.SIP/ListSIPInboundTrunk \-H "Authorization: Bearer <token-with-sip-admin>" \-H 'Content-Type: application/json' \-d '{}'
SIPService APIs
The SIPService APIs allow you to manage trunks, dispatch rules, and SIP participants.
tip
All RPC definitions and options can be found here.
CreateSIPInboundTrunk
Create an inbound trunk with the specified settings.
Returns SIPInboundTrunkInfo.
| Parameter | Type | Required | Description |
|---|---|---|---|
| name | string | yes | name of the trunk. |
| metadata | string | Initial metadata to assign to the trunk. This metadata is added to every SIP participant that uses the trunk. | |
| numbers | array<string> | yes | Array of provider phone numbers associated with the trunk. |
| allowed_addresses | array<string> | List of IP addresses that are allowed to use the trunk. Each item in the list can be an individual IP address or a Classless Inter-Domain Routing notation representing a CIDR block. | |
| allowed_numbers | array<string> | List of phone numbers that are allowed to use the trunk. | |
| auth_username | string | If configured, the username for authorized use of the provider's SIP trunk. | |
| auth_password | string | If configured, the password for authorized use of the provider's SIP trunk. | |
| headers | map<string, string> | SIP X-* headers for INVITE request. These headers are sent as-is and may help identify this call as coming from LiveKit for the other SIP endpoint. | |
| headers_to_attributes | map<string, string> | Key-value mapping of SIP X-* header names to participant attribute names. | |
| ringing_timeout | google.protobuf.Duration | Maximum time for the call to ring. | |
| max_call_duration | google.protobuf.Duration | Maximum call duration. | |
| krisp_enabled | bool | True to enable voice isolation. |
CreateSIPOutboundTrunk
Create an outbound trunk with the specified settings.
Returns SIPOutboundTrunkInfo.
| Parameter | Type | Required | Description |
|---|---|---|---|
| name | string | yes | name of the trunk. |
| metadata | string | User-defined metadata for the trunk. This metadata is added to every SIP participant that uses the trunk. | |
| address | string | yes | Hostname or IP the SIP INVITE is sent to. This is not a SIP URI and shouldn't contain the sip: protocol. |
| numbers | array<string> | yes | List of provider phone numbers associated with the trunk. |
| transport | SIPTransport | SIP transport protocol used for outbound call. | |
| numbers | array<string> | List of phone numbers that are allowed to use the trunk. | |
| auth_username | string | If configured, the username for authorized use of the provider's SIP trunk. | |
| auth_password | string | If configured, the password for authorized use of the provider's SIP trunk. | |
| headers | map<string, string> | SIP X-* headers for INVITE request. These headers are sent as-is and may help identify this call as coming from LiveKit for the other SIP endpoint. | |
| headers_to_attributes | map<string, string> | Key-value mapping of SIP X-* header names to participant attribute names. |
CreateSIPDispatchRule
Create dispatch rule.
Returns SIPDispatchRuleInfo.
| Parameter | Type | Required | Description |
|---|---|---|---|
| rule | SIPDispatchRule | yes | Type of dispatch rule. |
| trunk_ids | array<string> | yes | List of associated trunk IDs. |
| inbound_numbers | array<string> | If set, the dispatch rule only accepts calls made to numbers in the list. | |
| name | string | yes | Human-readable name for the dispatch rule. |
| metadata | string | Optional metadata for the dispatch rule. If defined, participants created by the rule inherit this metadata. | |
| attributes | map<string, string> | Key-value mapping of user-defined attributes. Participants created by this rule inherit these attributes. |
CreateSIPParticipant
note
Requires SIP call grant on authorization token.
Create a SIP participant to make outgoing calls.
Returns SIPParticipantInfo
| Parameter | Type | Required | Description |
|---|---|---|---|
| sip_trunk_id | string | yes | ID for SIP trunk used to dial user. |
| sip_call_to | string | yes | Phone number to call. |
| sip_number | string | SIP number to call from. If empty, use trunk number. | |
| room_name | string | yes | Name of the room to connect the participant to. |
| participant_identity | string | Identity of the participant. | |
| participant_name | string | Name of the participant. | |
| participant_metadata | string | User-defined metadata that is attached to created participant. | |
| participant_attributes | map<string, string> | Key-value mapping of user-defined attributes to attach to created participant. | |
| dtmf | string | DTMF digits (extension codes) to use when making the call. Use character w to add a 0.5 second delay. | |
| play_dialtone | bool | Optionally play dial tone in the room in the room as an audible indicator for existing participants. | |
| hide_phone_number | bool | If true, use a random value for participant identity and phone number ommitted from attributes. By default, the participant identity is created using the phone number (if the participant identity isn't explicitly set). | |
| ringing_timeout | google.protobuf.Duration | Maximum time for the callee to answer the call. | |
| max_call_duration | google.protobuf.Duration | Maximum call duration. | |
| enable_krisp | bool | True to enable voice isolation for the callee. |
DeleteSIPDispatchRule
Delete a dispatch rule.
Returns SIPDispatchRuleInfo.
| Parameter | Type | Required | Description |
|---|---|---|---|
| sip_dispatch_rule_id | string | ID of dispatch rule. |
DeleteSIPTrunk
Delete a trunk.
Returns SIPTrunkInfo.
| Parameter | Type | Required | Description |
|---|---|---|---|
| sip_trunk_id | string | yes | ID of trunk. |
GetSIPInboundTrunk
Get inbound trunk.
Returns GetSIPInboundTrunkResponse.
| Parameter | Type | Required | Description |
|---|---|---|---|
| sip_trunk_id | string | yes | ID of trunk. |
GetSIPOutboundTrunk
Get outbound trunk.
Returns GetSIPOutboundTrunkResponse.
| Parameter | Type | Required | Description |
|---|---|---|---|
| sip_trunk_id | string | yes | ID of trunk. |
ListSIPInboundTrunk
List inbound trunks.
Returns array<SIPInboundTrunkInfo>.
ListSIPOutboundTrunk
List outbound trunks.
Returns array<SIPOutboundTrunkInfo>.
TransferSIPParticipant
note
Requires SIP call grant on authorization token.
Transfer call to another number or SIP endpoint.
Returns google.protobuf.Empty.
| Parameter | Type | Required | Description |
|---|---|---|---|
| participant_identity | string | yes | Identity of the participant to transfer. |
| room_name | string | yes | Name of the room the participant is currently in. |
| transfer_to | string | yes | Phone number or SIP endpoint to transfer participant to. |
| play_dialtone | bool | Optionally play dial tone during the transfer. By default, the room audio is played during the transfer. |
Types
The SIP service includes the following types.
GetSIPInboundTrunkResponse
| Field | Type | Description |
|---|---|---|
| trunk | SIPInboundTrunkInfo | Inbound trunk. |
GetSIPOutboundTrunkResponse
| Field | Type | Description |
|---|---|---|
| trunk | SIPOutboundTrunkInfo | Outbound trunk. |
SIPDispatchRule
Valid values include:
| Name | Type | Value | Description |
|---|---|---|---|
| dispatch_rule_direct | SIPDispatchRuleDirect | 1 | Dispatches callers into an existing room. You can optionally require a pin before caller enters the room. |
| dispatch_rule_individual | SIPDispatchRuleIndividual | 2 | Creates a new room for each caller. |
| dispatch_rule_callee | SIPDispatchRuleCallee | 3 | Creates a new room for each callee. |
SIPDispatchRuleInfo
| Field | Type | Description |
|---|---|---|
| sip_dispatch_rule_id | string | Dispatch rule ID. |
| rule | SIPDispatchRule | |
| trunk_ids | array<string> | List of associated trunk IDs. |
| hide_phone_number | bool | If true, hides phone number. |
| inbound_numbers | array<string> | If this list is included, the dispatch rule only accepts calls made to the numbers in the list. |
| name | string | Human-readable name for the dispatch rule. |
| metadata | string | User-defined metadata for the dispatch rule. Participants created by this rule inherit this metadata. |
| headers | map<string, string> | Custom SIP X-* headers to included in the 200 OK response. |
| attributes | map<string, string> | Key-value mapping of user-defined attributes. Participants created by this rule inherit these attributes. |
SIPInboundTrunkInfo
| Field | Type | Description |
|---|---|---|
| sip_trunk_id | string | Trunk ID |
| name | string | Human-readable name for the trunk. |
| numbers | array<string> | Phone numbers associated with the trunk. The trunk only accepts calls made to the phone numbers in the list. |
| allowed_addresses | array<string> | IP addresses or CIDR blocks that are allowed to use the trunk. If this list is populated, the trunk only accepts traffic from the IP addresses in the list. |
| allowed_numbers | array<string> | Phone numbers that are allowed to dial in. If this list is populated, the trunk only accepts calls from the numbers in the list. |
| auth_username | string | Username used to authenticate inbound SIP invites. |
| auth_password | string | Password used to authenticate inbound SIP invites. |
| headers | map<string, string> | Custom SIP X-* headers to included in the 200 OK response. |
| headers_to_attributes | map<string, string> | Custom SIP X-* headers that map to SIP participant attributes. |
| ringing_timeout | google.protobuf.Duration | Maximum time for the caller to wait for track subscription (that is, for the call to be picked up). |
| max_call_duration | google.protobuf.Duration | Maximum call duration. |
| krisp_enabled | Boolean | True if krisp is enabled for the call. |
SIPOutboundTrunkInfo
| Field | Type | Description |
|---|---|---|
| sip_trunk_id | string | Trunk ID. |
| name | string | Trunk name. |
| metadata | string | User-defined metadata for trunk. |
| address | string | Hostname or IP address the SIP request message (SIP INVITE) is sent to. |
| transport | SIPTransport (enum) |
|
| numbers | array<string> | Phone numbers used to make calls. A random number in the list is selected whenever a call is made. |
| auth_username | string | Username used to authenticate with the SIP server. |
| auth_password | string | Password used to authenticate with the SIP server. |
| headers | map<string, string> | Custom SIP X-* headers to included in the 200 OK response. |
| headers_to_attributes | map<string, string> | Custom SIP X-* headers that map to SIP participant attributes. |
SIPParticipantInfo
| Field | Type | Description |
|---|---|---|
| participant_id | string | Participant ID. |
| participant_identity | string | Participant name. |
| room_name | string | Name of the room. |
| sip_call_id | string | SIP call ID. |
SIPTransport
Enum. Valid values are the following:
| Name | Value |
|---|---|
| SIP_TRANSPORT_AUTO | 0 |
| SIP_TRANSPORT_UDP | 1 |
| SIP_TRANSPORT_TCP | 2 |
| SIP_TRANSPORT_TLS | 3 |
SIPTrunkInfo
note
This type is deprecated. See SIPInboundTrunkInfo and SIPOutboundTrunkInfo.
| Field | Type | Description |
|---|---|---|
| sip_trunk_id | string | Trunk ID. |
| kind | TrunkKind | Type of trunk. |
| inbound_addresses | array<string> | IP addresses or CIDR blocks that are allowed to use the trunk. If this list is populated, the trunk only accepts traffic from the IP addresses in the list. |
| outbound_address | string | IP address that the SIP INVITE is sent to. |
| outbound_number | string | Phone number used to make outbound calls. |
| transport | SIPTransport | Transport protocol used for inbound and outbound calls. |
| inbound_numbers | array<string> | If this list is populated, the trunk only accepts calls to the numbers in this list. |
| inbound_username | string | Username used to authenticate inbound SIP invites. |
| inbound_password | string | Password used to authenticate inbound SIP invites. |
| outbound_username | string | Username used to authenticate outbound SIP invites. |
| outbound_password | string | Password used to authenticate outbound SIP invites. |
| name | string | Trunk name. |
| metadata | string | Initial metadata to assign to the trunk. This metadata is added to every SIP participant that uses the trunk. |
TrunkKind
Enum. Valid values are the following:
| Name | Value |
|---|---|
| TRUNK_LEGACY | 0 |
| TRUNK_INBOUND | 1 |
| TRUNK_OUTBOUND | 2 |