Technical data

Dialogic® Diva® SIPcontrol™ Software Configuration
Dialogic
®
Diva
®
SIPcontrol
TM
Software 1.8 Reference Guide page 42
Codec Configuration
To configure the codec list, click the Add button. To change the settings, click the Details button on the right
hand side. If you create a codec profile, make sure to select it in the SIP Peer Configuration under Enhanced
Configuration.
To open the online help for a specific parameter, click the parameter and a window with the help text will pop
up. You may configure the parameters shown in the graphic and explained below:
Name: Enter a name to easily identify the codec list. You may select the codec list in the SIP Peer configuration.
Available
Codecs:
This list includes all available codecs. If you want to use a certain codec, select it and click use codec.
The codec will be moved to the Selected Codecs list. The G.729 codec can only be used after you
have purchased and activated a license. See License Activation
on page 14 for more information.
Selected
Codecs:
By default, the G.711 A-law and G.711 µ-law codecs are selected. If you want to delete a certain codec,
select it and click remove codec. The codecs are used according to their position in the list, with the
first codec being the first to be used. To change the order, use the move up and move down buttons.
Packet interval
default:
Interval between RTP packets in an RTP stream. Also known as packetization time or RTP frame size.
Voice activity
detection:
If you activate voice activity detection, silence during a conversation is detected and the data rate is
reduced.
Comfort noise
support:
If you enable the comfort noise feature and the voice activity detection (VAD) is active on your system,
packets with low artificial background noise are sent to fill periods of total silence. Among others, total
silence in digital transmissions can have the unwanted effect that the called party may think that the
transmission has been lost and hang up prematurely.
Transmit DTMF
as RTP event:
With RTP events, DTMF and fax tones can be sent and received as digital notifications instead of audio
signals.
DTMF payload
type value:
Some endpoints expect a certain payload type value. You can enter any value between 96 and 127.
In calls from SIP to the PSTN, the Diva SIPcontrol software uses the value suggested by the endpoint.
Generally, this parameter is left at its default value.
T.38 Support: T.38 is a protocol that enables fax transmissions on the IP network in real time. Enable this option if
T.38 fax should be supported. Note that this feature is supported on Dialogic
®
Diva
®
Media Boards
with multiple ports only after activating the respective license. See License Activation
on page 14 for
more information.