User`s guide

94 Dialogic
®
1000 and 2000 Media Gateway Series User’s Guide
Parameter Reference
Voice Activity Detection
Description: Enables the use of voice activity detection (VAD) to reduce the amount of audio data
traffic. If VAD is enabled, the unit will stop the transmission of RTP audio data when no voice
activity is detected on the telephony port. Transmission is continued when voice activity is
detected. This drastically reduces the amount of audio traffic on the network.
Allowed Values:
• On = Voice activity detection is enabled.
• Off = Voice activity detection is disabled.
Default Value = On
INI File Parameter Name = dspVAD
Acceptable Media
Description: Specifies the Acceptable Media mode to be supported by the gateway. SRTP SDP
Offer must contain a=crypto line and can specify m=line with RTP/AVP or RTP/SAVP.
Allowed Values:
• RTP Only = Reject SDP Offer with 488 Not Acceptable Here if it does not specify m=line with
RTP/AVP.
• SRTP_Only = Reject SDP Offer with 488 Not Acceptable Here if it does not contain SRTP
request.
• RTP_SRTP = Accept RTP and/or SRTP SDP Offers. The gateway will select first m=line
specified.
Default Value = RTP_SRTP
INI File Parameter Name = sipAcceptableMedia
Continue Ringback on CN
Description: In early media, ringback will stop when any Comfort Noise or RTP stream is
received. This specifies whether to ignore Comfort Noise on early media. If Yes, then on detecting
Comfort Noise, ringback will continue to play. If No, then on detecting Comfort Noise, ringback
will stop playing. Detecting audio packet in the RTP stream will always stop ringback.
Allowed Values:
• Yes = Ringback will continue to play.
• No = Ringback will stop playing.
Default Value = Yes
INI File Parameter Name = gwIgnoreCn