[Home](./index.md) > [sip.js](./sip.js.md) > [OutgoingRequestMessageOptions](./sip.js.outgoingrequestmessageoptions.md) > [cseq](./sip.js.outgoingrequestmessageoptions.cseq.md) ## OutgoingRequestMessageOptions.cseq property Signature: ```typescript cseq?: number; ```