Matrix Telecom SARVAM UMG System Manual page 504

• Select the desired Silence Suppression in SDP for G.711 codec option. SARVAM UMG suppresses the
Silence packets and allows only the Voice packets to pass through.
This is used to deactivate certain processes during non-speech section of an audio session to avoid
unnecessary coding/ transmission of silence packets in VoIP application. Hence, it results in saving on
computation and network bandwidth.
You can select either Do Not Send, Send using Silence Suppression attribute or Send using VAD attribute.
If you select Do Not Send, SARVAM UMG will not send any "Silence Suppression" media attribute in the
SDP offer / answer exchanges.This is not dependant on the Silence Suppression check box.
If the Silence Suppression check box is disabled. and you select Send using Silence Suppression
attribute, SARVAM UMG will send Silence Suppression=OFF in the SDP offer / answer exchanges.
If the Silence Suppression check box is enabled. and you select Send using Silence Suppression attribute,
SARVAM UMG will send Silence Suppression=ON in the SDP offer / answer exchanges.
If the Silence Suppression check box is disabled. and you select Send using VAD attribute, SARVAM
UMG will send VAD=NO in the SDP offer / answer exchanges.
If the Silence Suppression check box is enabled. and you select Send using VAD attribute, SARVAM UMG
will send VAD=YES in the SDP offer / answer exchanges.
Default: Send using Silence Suppression attribute
• Select the Comfort Noise (CN) check box, if you want SARVAM UMG to negotiate the Comfort Noise
received in the SDP body with the remote peer. Default: Disabled.
• Select the Include ptime header in SDP check box, if you want SARVAM UMG to add ptime header in
the SDP offer / answer exchanges. Default: Disabled.
• Clear the Send Re-INVITE when multiple codec is received in 200 (OK) check box, if you do not want
SARVAM UMG to send Re-INVITE message and use only the first codec from the multiple codecs
received in 200 (OK). Default: Enabled.
• Select the Send all codecs while sending Offer within the dialog check box, if you want SARVAM UMG
to send all the codec configured on SIP Trunk in same order as configured while sending the RE-INVITE
message to hold or unhold the call.
When RE-INVITE without SDP is received then the system sends SDP offer in 200 OK response with all
the codecs configured for that SIP trunk. The codec order is same as configured for the SIP Trunk.
Default: Disabled.
• Select the Send multiple codecs in SDP Answer check box, if you want SARVAM UMG to send all the
configured codecs in SDP answer. Default: Disabled.
The codecs sent will depend on the option you select in Codec Priority.
• When Codec Priority is set as Local then system sends all the codecs as per local preference.
Matrix SARVAM UMG System Manual 498