Contact header MUST be present in the requests that lead to the establishing of a dialogue. In your case its INVITE. According to rfc3261 , in other cases it may not be required. Open to a discussion though.
*V YAswanth RAparti B.E Electrical and Electronics. * On 3 November 2012 10:09, Tamjid Ali <[email protected]> wrote: > > > Hi,Can anyone clear me why contact header present in each sip message even > after knowing each other after 1xx response? If contact header is not > present in subsequent sip messages then what will happen?? > Thanks®ards,Ali > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
