Adding a Codec

A codec is a  software algorithm used to compress/decompress speech or audio signals in Voice-over-IP (VoIP) networks.

Use this procedure to add a codec option to a voice class codec in a region.

Procedure

You must be in the Design View to add a codec to a voice class codec.

  1. Expand the dial plan tree to view all components.

  2. Locate the region which contains the voice class codec you want to add a codec to.

  3. Click the Voice Class Codecs tab.

  4. Double-click the voice class codec you want to add a codec to.

  5. Click the Codecs tab.

  6. Right-click and choose Add from the menu.

  7. Enter the attribute information:

Note: Not all codecs are available on all gateway platforms. Check the Cisco IOS version on your gateway to see which codecs are supported.

Codec Option

Description

g711alaw

G.711 a-Law at 64,000 bits per second (bps)

g711ulaw

G.711 u-Law at 64,000 bps

g723ar53

G.723.1 Annex A at 5300 bps

g723ar63

G.723.1 Annex A at 6300 bps

g723r53

G.723.1 at 5300 bps

g723r63

G.723.1 at 6300 bps

g726r16

G.726 at 16,000 bps

g726r24

G.726 at 24,000 bps

g726r32

G.726 at 32,000 bps

g728

G.728 at 16,000 bps

g729br8

G.729 Annex A and B at 8000 bps

g729r8

G729 Annex A at 8000 bps

gsmcfr

12200 bps

gsmfr

13200 bps

transparent

Transparently pass capabilities between endpoints.

Note: When you specify a transparent codec it must be the preference 1 codec.

       8.   Click Apply. The codec is added.

Click Cancel to cancel this procedure.