[Home](./index.md) > [sip.js](./sip.js.md) > [MessageUserAgentServer](./sip.js.messageuseragentserver.md) > [(constructor)](./sip.js.messageuseragentserver._constructor_.md) ## MessageUserAgentServer.(constructor) Constructs a new instance of the `MessageUserAgentServer` class Signature: ```typescript constructor(core: UserAgentCore, message: IncomingRequestMessage, delegate?: IncomingRequestDelegate); ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | core | UserAgentCore | | | message | IncomingRequestMessage | | | delegate | IncomingRequestDelegate | |