[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgentOptions](./sip.js.useragentoptions.md) > [sipjsId](./sip.js.useragentoptions.sipjsid.md) ## UserAgentOptions.sipjsId property An id uniquely identify this user agent instance. Signature: ```typescript sipjsId?: string; ```