The reason why the specs advice to not send a CANCEL if a 1xx is not received is because there is a big chance that the CANCEL will suffer the same fate as the INVITE - that is it will not get any response either. This ought to save your implementation some unrequired work. However, there is really no harm done if you send a CANCEL regardless of whether you received a provisional response or not.
On 06/10/2013 06:17 PM, Rupesh Mothe wrote: > Can CANCEL be sent after receiving 100 trying? Here 100 trying doesn't > transmitted from UAS > > > > > > Thanks, > > Rupesh Mothe |Tech Mahindra Ltd, Pune | Extn. 3671 | Cell No. > +91-9960727012 > > > > > > > ============================================================================================================================Disclaimer: > This message and the information contained herein is proprietary and > confidential and subject to the Tech Mahindra policy statement, you may > review the policy at <a > href="http://www.techmahindra.com/Disclaimer.html";>http://www.techmahindra.com/Disclaimer.html</a> > externally and <a > href="http://tim.techmahindra.com/tim/disclaimer.html";>http://tim.techmahindra.com/tim/disclaimer.html</a> > internally within Tech > Mahindra.============================================================================================================================ > _______________________________________________ > 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
