An update - I think I pinpointed the problem. It appears that the RTP
timestamps are factoring in; for example: if I send a DTMF 1 that has a
timestamp of 100, then send another DTMF 1 with a greater timestamp of, say
200, everything works great. However, if I reverse the scenario, the second
DTMF tone will not be recognized. The actual digit (0-9) being sent doesn't
appear to matter - it's strictly the timestamps associated with the RTP EVENTS.
pcap_play_audio wouldn't happen to have an option to update these timestamps,
would it? :)
Long story short, the DTMF timestamps need to be at least greater than the
previous one sent. Is there an easy way to update the timestamps of the DTMF
pcap files? I've tried looking at editcap with the -t option and it doesn't
appear to update at all... if I could somehow re-import an exported pcap file
from txt (and then modify the timestamps), that could work.... text2pcap seems
finicky in formant and not exactly sure how to use...
Any ideas?
From: grinch_champ...@hotmail.com
To: jordan.walbes...@gmail.com; sipp-users@lists.sourceforge.net
Date: Tue, 12 May 2009 21:50:01 -0500
Subject: Re: [Sipp-users] Strange DTMF Issue
Jordan--
Thanks for the response - please see the attached .xml file. The begining is
fairly lengthy due to a 302 redirect so I have to perform some manipulation to
get the second invite to the right port. Anyhow, the pcap play areas where the
dtmf is actually sent is towards the bottom, after the second ACK, before the
BYE.
I've had the same symptoms with your basic invite/100/180/200/ACK scripts,
FYI... definately weird (and frustrating!).
Thanks,
John
Date: Tue, 12 May 2009 17:51:25 -0400
From: jordan.walbes...@gmail.com
To: sipp-users@lists.sourceforge.net
Subject: Re: [Sipp-users] Strange DTMF Issue
Would you be able to share the script/xml file that you are using with us?
~Jordan--
Jordan L. Walbesser
Computer Engineering B.S. '07
Juris Doctor '10
Mobile: (716) 640-0532
Web: www.buffalo.edu/~jlw28
On Tue, May 12, 2009 at 5:39 PM, John Rodriguez <grinch_champ...@hotmail.com>
wrote:
I'm communicating with MS Speech Server 2k7 - my SIPp calls are successfully
connecting and I can replay the RTP traffic so I know things from a connection
stand point are very good.
The issue I'm running into is that it seems I can't send two of the same DTMF
digits for the same call - it's like the digit will no longer be recognized
after it was used once. For example, when I connect with the IVR, I send a
DTMF 1 (though pcap play) which gets successfuly processed by the IVR. If I
try to send another DTMF 1 for the subsequent menu, the IVR will not respond to
it. If I send a DTMF 2 (after the first DTMF 1), it is recognized and takes me
to another menu. Anyone run into these problems? I've verified in Wireshark
the DTMF digits are indeed being sent. It's almost as if EACH DTMF digit sent
needs to be unique somehow.
What's even stranger is if I record my call via xlite and SAVE each DTMF digit
sent through the softphone and use it in my SIPp script (instead of the DTMF
digits that come in the pcap directory), everything works fine.... the only
problem is that this is seriously labor intensive and not sure why I have to do
that.
However, if I send the same DTMF digit that I re-created from the softphone,
the same issue occurs (ie. it's not like I can just re-record the DTMF tones
generated via the softphone).
Thanks in advance!
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