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More than likely the H323 gateway is not supporting emptycapabilities.
Make sure you are on a recent IOS version and put the
'emptycapabilities' command under voice service voip->h323.
Another option would be to use an MTP which supports codec
passthrough. Keep in mind with the MTP in use, you will need enough
video locations between the Video enabled IP Phone and the MTP as well
as the MTP and the H323 gateway. <br>
<br>
Adam<br>
<br>
-------- Original Message --------<br>
Subject: [cisco-voip] Adhoc conference calls drop without MTP<br>
From: Mooney, Nicholas <a class="moz-txt-link-rfc2396E" href="mailto:Nicholas.Mooney@astrazeneca.com"><Nicholas.Mooney@astrazeneca.com></a><br>
To: <a class="moz-txt-link-abbreviated" href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a><br>
Date: 8/6/09 6:26 PM<br>
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<p class="MsoNormal">Hi<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have an AudioCodes GSM (SIP) gateway connected
to a 2821
H.323 gateway via SIP which is then connected to CUCUM via h.323<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regular outbound calls work fine. CUCM sends all
0.@ calls
to the H.323 gateway and then the gateway matches mobile phones call to
a SIP
dial-peer and sends the call to the AudioCodes GSM gateway.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The only problem is when a call via the GSM
gateway gets added
to an adhoc conference, it gets dropped/disconnected all together after
about
10 seconds. If I configure the H.323 gateway to require an MTP then the
calls
don’t get dropped, however any CUVA (Video Advantage) user who makes a
PSTN call gets a message on their phone saying “Video Bandwidth
Unavailable”. The CUVA doco says this is because an MTP is being used
and
MTP’s don’t support video.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The only MTP’s in my network are the default
ones configured
in CUCUM.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any ideas on how I can get the calls via the GSM
gateway not
to drop when added to an adhoc conference without enabling an MTP on
the
gateway in CUCM? <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Or is there a way to have PSTN calls for CUVA
users not show
the “Video Bandwidth Unavailable” message when it’s clearly
an audio-only call when an MTP is enabled for the gateway? <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Nick.<o:p></o:p></p>
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