Configuring The Gsmamr-Nb Codec For The High-Density Packet Vfc; Overview And Restrictions For The Gsmamr-Nb Codec - Cisco VGD-1T3 Software Configuration Manual

Voice gateway

Table of Contents

Configuring and Managing the High-Density Packet Voice Feature Card

Command or Action

Step 5

exit

Example:

Router(config-voicedsp)# exit

Step 6

end

Example:

Router(config)# end

Configuring the GSMAMR-NB Codec for the High-Density

Packet VFC

This section provides information about the following:

•

Overview and Restrictions for the GSMAMR-NB Codec

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.

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:

•

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.

Table 1

Overview and Restrictions for the GSMAMR-NB Codec, page 75

GSMAMR-NB Codec Compliance with RFC 3267, page 76

Configuring the GSMAMR-NB Codec on the High-Density Packet VFC, page 77

FRVGD-AMR-LIC for the Cisco VGD 1T3

contains codec mode and bit rate information for the AMR codec.