Hi Jiri,
Been there. We switched from INFO to RFC2833 for this same reason. Take a look at: http://bugs.digium.com/bug_view_page.php?bug_id=0001033
Not only retransmissions are affected but out of order packets too. This behaviour can be partly blamed on the RFC:
"In addition, the INFO method does not define additional mechanisms for ensuring in-order delivery. While the CSeq header will be incremented upon the transmission of new INFO messages, this should not be used to determine the sequence of INFO information. This is due to the fact that there could be gaps in the INFO message CSeq count caused by a user agent sending re-INVITES or other SIP messages. "
Regards, Andres
Jiri Kuthan wrote:
I'm wondering whether people know if there could be a problem with * receiving retransmissions of INFO/DTMF requests.
I'm trying to play DTMF via INFO to *. If it takes a 200 reply too long to come back, the request is retransmitted. Whenever this happens, the IVR down in PSTN reports that the number sequence is incorrect.
This makes me guess that * turns INFO retransmissions into new DTMF digits on the PSTN part.
Does anybody have the same experience? Is it a known problem? Are there any patches?
Thanks,
-jiri
-- Jiri Kuthan http://iptel.org/~jiri/
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