[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgentCoreConfiguration](./sip.js.useragentcoreconfiguration.md) > [sipjsId](./sip.js.useragentcoreconfiguration.sipjsid.md) ## UserAgentCoreConfiguration.sipjsId property Unique instance id. Signature: ```typescript sipjsId: string; ```