[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgentCoreConfiguration](./sip.js.useragentcoreconfiguration.md) > [loggerFactory](./sip.js.useragentcoreconfiguration.loggerfactory.md) ## UserAgentCoreConfiguration.loggerFactory property Logger factory. Signature: ```typescript loggerFactory: LoggerFactory; ```