Specifications

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Catalyst 4224 Access Gateway Switch Software Configuration Guide
OL-2031-02
Chapter 1 Product Overview
Recommended Configurations
With the MTP Required checkbox enabled:
The Catalyst 4224 is 10.253.1.1
Transcoder is Catalyst 6000 at Central : 10.1.1.11
C4224_SF# sh ip sock
Proto Remote Port Local Port In Out Stat TTY
OutputIF
17 10.1.1.11 16541 10.253.1.1 18757 0 0 1 0
With the MTP Required checkbox not enabled:
IP Phone is 10.6.1.4
C4224_SF# sh ip sock
Proto Remote Port Local Port In Out Stat TTY
OutputIF
17 10.6.1.4 26287 10.253.1.1 17047 0 0 1 0
When the MTP Required checkbox is enabled, a call between a local IP phone and
an FXS analog POTS connected to the Catalyst 4224 is anchored at the transcoder
at the Central site, and local calls use WAN bandwidth. When the MTP Required
checkbox is not enabled, the local FXS-to-IP phone call is directly connected
between the Catalyst 4224 H.323 gateway and the IP phone.
H323-Gateway VOIP Bind SRCADDR Command
You must always use the following command to configure the IP address of the
gateway. This command ensures that the IP address included in the H.323 packet
is deterministic—it consistently indicates the same address for the source. If the
end point is non-deterministic, the call is anchored at the serial interface port and
silence or one-way audio occurs. The following sample configuration shows the
H323-gateway voip bind srcaddr command:
interface Loopback1
description h323 gateway address
ip address 10.253.1.1 255.255.255.0
h323-gateway voip bind srcaddr 10.253.1.1
You must place the h323 bind interface command on the interface with the IP
address that Cisco CallManager uses to define the H.323 gateway.