[cisco-voip] CCM 4.1 and H.323 outbound FastStart

[Ryan Ratliff]

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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