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Recommended Configurations
Note
MTP Required on Cisco CallManager
Catalyst 4224 Access Gateway Switch Software Configuration Guide
1-26
progress_ind alert enable 8
port 3/1:23
forward-digits all
alert enable 8 is a hidden command option, which you cannot find by using
the ? at the CLI.
The following sample configuration shows what happens when you try to find this
command option:
C4224-2(config-dial-peer)# progress_ind alert ?
% Unrecognized command
This ringback situation applies only to PRI. It does not apply to BRI.
Prior to support for H.323 Version 2, you needed to enable the MTP Required
checkbox. This checkbox is located in the Catalyst 4224 H.323 Gateway
Configuration page in Cisco CallManager to define an H.323 gateway. All
Cisco IOS H.323 gateways with Cisco IOS 12.07 or later now support H.323
Version 2. You should not ordinarily enable this checkbox box when defining the
Catalyst 4224 as an H.323 Gateway. The only time you should check the box is if
transcoding is used at the central site. Transcoding would be necessary in
situations where the Catalyst 4224 uses G.729 for IP WAN calls and a voice mail
system at the central site supports G.711 only.
If you enable MTP Required on the Catalyst 4224 H.323 Gateway, analog POTS
calls to an IP phone locally connected will traverse the IP WAN. The call between
the analog FXS POTS and the IP Phone is anchored at the central site transcoding
device. This is normal behavior for a Cisco IOS H.323 gateway when MTP
Required is enabled. This leads to performance that is not optimal. Therefore,
unless transcoding is required, Media Termination Point (MTP) should not be
enabled on the H.323 Gateway definition for Catalyst 4224. Another option
would be to use G.711 across the IP WAN.
The following sample configurations show how the VoIP endpoints can be
verified.
Chapter 1
Product Overview
OL-2031-02
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Table of Contents
Troubleshooting
