Vikram, PRACK is for the reliability of provisional responses, 1XX messages (except 100). The reliability of 2xx, 3xx, 4xx, 5xx, and 6xx responses to INVITEs is achieved using the ACK method.
This is basically for the critical messages like 180 and 183 i.e when UAS wants the conformation from UAC that these 1XX messages are delivered properly. Check out the RFC3262 for more details on this. Cheers, Aman On Tue, Jul 24, 2012 at 12:48 PM, vikram <[email protected]>wrote: > > > > > > -- > > _______________________________________________ > 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
