Managing Input Gain For Cisco Ip Voice Applications; Fxs Emulation Example - Cisco WS C4224V 8FXS - 200Mbps Ethernet Switch Software Configuration Manual

Chapter 5 Configuring the Voice Interfaces
Note

Managing Input Gain for Cisco IP Voice Applications

FXS Emulation Example

OL-2031-02
You can configure DS-0 hunt groups by assigning a range of time slots to a DS-0
group, and then configuring multiple voice peers with the same destination pattern
pointing to multiple voice ports.
For example, the following command assigns 12 time slots to DS-0 group 1:
c4224(config-controller)# dso-group 1 timeslots 1-12 type
fxs-loop-start
After completing these steps, configure the route pattern and dial plan and
save your configuration, as described in
section on page 5-16.
When using the FXO ports on a Catalyst 4224, set the input gain to a value
provides adequate audio quality for Cisco IP voice applications or the Cisco 7960
IP Phone. Input gain values higher than 12 may cause dual tone multifrequency
(DTMF) recognition difficulties.
Cisco recommends that you use the Cisco CallManager graphical user interface
to set the input gain. However, you can also enter the following series of
commands from the Cisco IOS command line to set input gain:
c4224# configure terminal
c4224(config)# voice-port x/x/x input gain value
Permitted entries for value are from -6 to 14.
By connecting the T1-CAS port on a Catalyst 4224 to a T1 channel bank using
FXS emulation, you can achieve high port density when connecting POTS and
VoIP endpoints. You can configure the dial plan for this configuration by treating
Cisco CallManager as the only H.323 endpoint, or by configuring H.323
Catalyst 4224 Access Gateway Switch Software Configuration Guide
Configuring T1-CAS Analog Emulation (H.323)
"H.323 Gateway Configuration"
5-21