[Home](./index.md) > [sip.js](./sip.js.md) > [UserAgentCoreConfiguration](./sip.js.useragentcoreconfiguration.md) > [viaForceRport](./sip.js.useragentcoreconfiguration.viaforcerport.md) ## UserAgentCoreConfiguration.viaForceRport property Force use of "rport" Via header field parameter. Signature: ```typescript viaForceRport: boolean; ``` ## Remarks https://www.ietf.org/rfc/rfc3581.txt