[cisco-voip] CCM 4.1 and H.323 outbound FastStart
Louis R. Marascio
marascio at metreos.com
Tue Jul 19 11:41:11 EDT 2005
Ryan,
Thanks for the informative response. My hope was that the MTP would
only be used IF transcoding was required, and in other circumstances it
would not be leveraged. I wonder, why can't CCM send the IP phone an
OpenReceiveChannel as soon as it sees the H.323 gateway wants to use
fast start?
Thanks for your help,
Louis
---
Louis R. Marascio
Metreos Corporation
t: +1 (512) 687 2005
m: +1 (512) 964 4569
e: marascio at metreos.com
-----Original Message-----
From: Ryan Ratliff [mailto:rratliff at cisco.com]
Sent: Monday, July 18, 2005 10:14 PM
To: Louis R. Marascio
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] CCM 4.1 and H.323 outbound FastStart
The MTP will be required for every fast-start call. The MTP is used so
that CM has a real IP address and port to tell the gateway to use. An
IP phone can't provide CM with a port/IP address this early in the call
thus the need for the MTP. If CM fails to allocate an MTP the call
should proceed as slow start and supplementary services (hold,
conference, transfer, etc) will be disabled for the call.
Remember an MTP is not necessarily a transcoder, though a transcoder
can almost always act as an MTP. The few exceptions are with IOS
gateways doing g.729 pass through. The CMM is the only one that can
provide this functionality in a transcoder. With an NM-HDV based DSP
resources you will need to define a MTP profile configured to use g.729
in order to achieve this functionality. If you go with a router-based
software MTP it can support up to 500 simultaneous calls so
provisioning should not be an issue.
-Ryan
On Jul 18, 2005, at 6:08 PM, Louis R. Marascio wrote:
Hey folks,
We have an H.323 gateway and would like to use outbound fast start.
However, in setting it up I noticed that it was forcing me to use a
media termination point. Is this MTP used for every call, regardless of
codec? Or will it only be used in the case that trans-coding is
required? I don't see much benefit in using fast start if we have to
use an MTP for every outbound call from the gateway.
Thanks for your help,
Louis
---
Louis R. Marascio
Metreos Corporation
t: +1 (512) 687 2005
m: +1 (512) 964 4569
e: marascio at metreos.com
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