[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgentCore](./sip.js.useragentcore.md) > [subscribe](./sip.js.useragentcore.subscribe.md) ## UserAgentCore.subscribe() method Send SUBSCRIBE. Signature: ```typescript subscribe(request: OutgoingRequestMessage, delegate?: OutgoingSubscribeRequestDelegate): OutgoingSubscribeRequest; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | request | OutgoingRequestMessage | Outgoing request. | | delegate | OutgoingSubscribeRequestDelegate | Request delegate. | Returns: `OutgoingSubscribeRequest`