Hi Nauman, Generally, the combination of PRACK / UPDATE is used in "precondition" call scenarios.For an example, you can look into basic IMS call scenarios.
Thanks and Regards, Rajat Chandna ________________________________________ From: [email protected] [[email protected]] On Behalf Of Nauman Sulaiman [[email protected]] Sent: Wednesday, June 22, 2011 10:10 PM To: [email protected] Subject: [Sip-implementors] Is PRACK and UPDATE mandatory in some use cases Hi Some UAs do not support PRACK or UPDATE and still work fine with various Proxies, PBX, Softswitches etc. Are there any scenarios or well known Proxies,Softswitches that require mandatory PRACK and UPDATE support for a UA to be interoperable? Or maybe some features will not be available if support for these methods is not there. Just trying to understand where PRACK and UPDATE are used. Thanks _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors =============================================================================== Please refer to http://www.aricent.com/legal/email_disclaimer.html for important disclosures regarding this electronic communication. =============================================================================== _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
