o Daniel-Constantin Mierla on 04/24/2012 04:04 PM:
Btw, what Asterisk/Sems does in this situation (just for the developers of such end points here :-) ), any special hint-header added?
SEMS adds "Retry-After: 0" if the method is NOTIFY. Additionally, you can now ignore the low CSeq for NOTIFY if ignore_notify_lower_cseq=yes in sems.conf.
but yes, a Warning would be in order.
Stefan