Cisco AS5350XM Configuration Manual page 144

Using the AMR-NB Codec
If the previous download was unbundled firmware, enter the no form of the firmware location command
Step 5
to revert to the default Cisco IOS bundled DSP firmware:
AS5400(config-voicedsp)# no firmware location
Step 6 Type the exit command to exit DSP configuration mode.
AS5400(config-voicedsp)# exit
AS5400(config)#
Press the Enter key to verify your command registers, and then type Ctrl-Z to return to privileged EXEC
Step 7
mode.
AS5400(config)# Ctrl-Z
AS5400#
Step 8 Save your changes.
AS5400# copy running-config startup-config
Using the AMR-NB Codec
You must buy a license to access the DSPWare that supports the AMR-NB codec. It is recommended that
Note
you purchase a Cisco SMARTnet contract in order to streamline the process of getting the AMR-NB
codec DSPWare. When obtaining your license, use the following part numbers:
FR535XM-AMR-LIC for the Cisco AS5350XM
FR54XM-AMR-LIC for the Cisco AS5400XM
For more information, contact your Cisco representative or visit the following Cisco.com website to
obtain a Cisco SMARTnet contract:
http://www.cisco.com/en/US/partner/products/svcs/ps3034/ps2827/ps2978/serv_datasheet09186a0080
092491.html
The Adaptive Multirate Narrow Band (AMR-NB) codec is a high complexity multimode codec that
supports eight narrowband speech encoding modes with bit rates between 4.75 and 12.2 kbps. The
sampling frequency used in AMR-NB is 8000 Hz and the speech encoding is performed on 20 ms speech
frames. Therefore, each encoded AMR-NB speech frame represents 160 samples of the original speech.
The AMR-NB codec was originally developed and standardized by the European Telecommunications
Standards Institute (ETSI) for Groupe Speciale Mobile (GSM) cellular systems. and chosen by the Third
Generation Partnership Project (3GPP) as the mandatory codec for third generation (3G) cellular
systems.
Table 11
Cisco AS5350XM and Cisco AS5400XM Universal Gateways Software Configuration Guide
8
contains codec mode and bit rate information for the AMR codec.
Managing and Troubleshooting the Voice Feature Card