[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgentCoreConfiguration](./sip.js.useragentcoreconfiguration.md) ## UserAgentCoreConfiguration interface User Agent Core configuration. Signature: ```typescript export interface UserAgentCoreConfiguration ``` ## Properties | Property | Type | Description | | --- | --- | --- | | [aor](./sip.js.useragentcoreconfiguration.aor.md) | URI | Address-of-Record (AOR). | | [contact](./sip.js.useragentcoreconfiguration.contact.md) | Contact | Contact. | | [displayName](./sip.js.useragentcoreconfiguration.displayname.md) | string | From header display name. | | [hackViaTcp](./sip.js.useragentcoreconfiguration.hackviatcp.md) | boolean | Force Via header field transport to TCP. | | [loggerFactory](./sip.js.useragentcoreconfiguration.loggerfactory.md) | LoggerFactory | Logger factory. | | [routeSet](./sip.js.useragentcoreconfiguration.routeset.md) | Array<string> | Preloaded route set. | | [sipjsId](./sip.js.useragentcoreconfiguration.sipjsid.md) | string | Unique instance id. | | [supportedOptionTags](./sip.js.useragentcoreconfiguration.supportedoptiontags.md) | Array<string> | Option tags of supported SIP extenstions. | | [supportedOptionTagsResponse](./sip.js.useragentcoreconfiguration.supportedoptiontagsresponse.md) | Array<string> | Option tags of supported SIP extenstions. Used in resposnes. | | [userAgentHeaderFieldValue](./sip.js.useragentcoreconfiguration.useragentheaderfieldvalue.md) | string | undefined | User-Agent header field value. | | [viaForceRport](./sip.js.useragentcoreconfiguration.viaforcerport.md) | boolean | Force use of "rport" Via header field parameter. | | [viaHost](./sip.js.useragentcoreconfiguration.viahost.md) | string | Via header field host name or network address. | ## Methods | Method | Description | | --- | --- | | [authenticationFactory()](./sip.js.useragentcoreconfiguration.authenticationfactory.md) | DEPRECATED Authentication factory function. | | [transportAccessor()](./sip.js.useragentcoreconfiguration.transportaccessor.md) | DEPRECATED: This is a hack to get around Transport requiring the UA to start for construction. |