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