Re: [Serdev] Re: Handling of early CANCELs - was Re: [Serusers] SER Nokia CANCEL Problem

FYI: This is the pragmatic approach how openser users handle the problem: 1. drop the CANCEL if there is no corresponding INVITE transaction. The UAC must retransmit the CANCEL and meanwhile there should be the INVITE transaction. (since 1.0) if ( is_method("CANCEL") && !t_check_trans() ) { # CANCEL without matching INVITE transaction, ignore! # May happen if the INVITE is slower than the CANCEL. # Ignore the CANCEL, as the client will retransmit it, and maybe # the INVITE transaction is already created for the next CANCEL xlog("L_WARN","$ci CANCEL without matching transaction ... ignore\n"); exit; }