Vocoder Entry

Overview

Description

This pane specifies a single payload type and size for use by the IP Bearer Profile.  Multiple Supported Vocoder objects may be specified for each IP Bearer Profile. The collection of these objects is sent in a prioritized order during IP signaling (SIP/H.323) negotiation.

 

Related Topics

VoIP Overview

Configuring IP Bearer Profiles

 

Accessing this Pane

Dialogic IMG EMS-> IP Bearer Profiles-> IP Bearer Profile-> Supported Vocoders

 

Maximum Objects: 7 per IP Bearer Profile

 

Technical Notes

 

ClientView Pane

SC_Vocoder_Entry-ER6.png

 

Field Descriptions

Entry ID

This field specifies the ID of the vocoder.

Note: This field does not control the priority in the Terminal Capability Exchange. The priority is controlled by the order in the Supported Vocoder Display Table.

 

Payload Type

This field specifies the desired codec for the Vocoder entry.

 

IMPORTANT NOTE: You must have your Host Flags set correctly to enable certain vocoders. Additionally, you must have a valid license for AMR and iLBC. See Setting Host Flags.

 

Preferred Payload Size (ms)

This field specifies the desired payload size for the selected Payload Type.

Defaults

AMR = 20

EVRC = 20

G.711 alaw = 20

G.723 (5.3/6.3) = 30

G.729, G.729E/G = 20

iLBC = 20

 

Minimum Payload Size (ms)

This field specifies the minimum payload size for the selected Payload Type.

Defaults

AMR = 20

EVRC = 20

G.711 alaw = 10

G.723 (5.3/6.3) = 30

G.729, G.729E/G = 10

iLBC = 20

 

Maximum Payload Size (ms)

This field specifies the maximum payload size for the selected Payload Type.

Defaults

AMR = 20

EVRC = 20

G.711 (alaw/u-law) = 30

G.723 (5.3/6.3) = 60

G.729 = 60

iLBC = 30

 

Default Payload Type

Applies only to AMR, EVRC, and iLBC.

Defaults

AMR = 97

EVRC = 98

iLBC = 96

 

Annex B Support

The media attribute "Annexb=no" is sent by the IMG in the SIP SDP, when enforcing the use of the G.729a payload type. Note that the media attribute "Annexb=yes" is not sent by the IMG in a SIP SDP, as this value is implied when unspecified in the SDP.

 

Display Table

This table lists the Supported Vocoders to be used in the H.245 Terminal Capability Exchange for IP Bearer Profile (parent) object. The entries are listed in descending priority. You can change the order using the up and down buttons on the toolbar.