Supported Codecs

Overview:

In ClientView under the IP Bearer Profiles Object New Vocoder Entries can be defined. Each of these entries can have a different codec configured. Attributes such as payload type and size (preferred, minimum, and maximum) can be configured. When there are multiple vocoder entries configured under the IP Bearer Profile object a priority order can be configured that is used in the H.245 Terminal Capability Exchange for codec negotiation with other network elements.

 

The IMG currently supports the following codecs: See Table Below

 

CODEC

SIP

H.323

G.711 alaw/ulaw

Yes

Yes

G.723 5.3 kbps

Yes

Yes

G.723 6.3 kbps

Yes

Yes

G.729

Yes

Yes

G.729E/G (10.3.2 ER2 and above)

Yes

Not Supported

T.38

Yes

Yes

iLBC 20 ms

Yes

Not Supported

iLBC 30 ms

Yes

Not Supported

AMR*

Yes

Not Supported

EVRC

Yes

Not Supported

G.726-32/G.721 Static Payload

Yes

Not Supported

G.726-32/G.721 Dynamic Payload

Yes

Not Supported

GSM-FR Static Payload

Yes

Not Supported

GSM-FR Dynamic Payload

Yes

Not Supported

 

* Using the AMR-NB resource in connection with one or more Dialogic products mentioned herein does not grant the right to practice the AMR-NB standard. To seek a patent license agreement to practice the standard, contact the VoiceAge Corporation at http://www.voiceage.com/licensing.php

 

Codec Descriptions:

G.711:

 

G.723:

 

G.726-32/G.721:

 

G.729:

 

G.729 Annex B Support:

There is a drop down menu where the user can decide whether annexb will be used. The choices are annexb=no, annexb=yes, or annexb=Not Used. AnnexB is currently supported only in G.729. If configuring the G.729 codec in ClientView the annexb field is defaulted to "Yes". See Below for more information. This feature is configured using the Vocoder Entry pane.

 

 

G.729 E/G (10.3.2  ER 2 and above):

              m=audio  5104  RTP/ AVP 96

              a=rtpmap:96  G729E/8000

              a=fmtp:96 annexb=no

              a=ptime:30

              a=maxptime:60

 

iLBC (internet Low Bitrate Codec):

 

EVRC (Enhanced Variable Rate Codec):

 

GSM-AMR (Global System for Mobile - Adaptive Multi-Rate):

 

* Using the AMR-NB resource in connection with a Dialogic® product does not grant the right to practice the AMR-NB standard. To seek a patent license agreement to practice the standard, contact the VoiceAge Corporation at http://www.voiceage.com/licensing.php.

 

GSM-FR:

 

 

Host Flags:

The host flag in the dhcpd.conf file located in /etc must be given a numerical value. This value is calculated by using certain attributes such as T1/E1, SD Card/FTP Server and Codecs being used. See the links below for information regarding calculation of the correct hostflag value for your particular network.

 

Related Topics:

Setting Host Flags