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VoIP Parameters 
You can use the VoIP > Advanced VoIP Setup > VoIP Parameters menu to configure various common aspects 
of the VoIP Subsystem device. The menu items include: 
• 
 
• 
• 
Audio Settings 
Parameter 
Description 
Default 
Preferred Codecs 
Lets you arrange the Codec names in 
order of preference. These entries must 
agree with the
specified 
on the My VoIP Account page. 
G.711u, iLBC, 
G.729B, 
G.711A 
Silence Suppression Enable 
Prevents audio frames from being sent 
during periods of silence, thus reducing 
the network traffic necessary for making 
calls. (Note: This feature is useful only 
with audio codecs that support silence 
suppression.) 
Disabled 
Echo Canceller Enable 
If enabled, the G.168 echo canceller is 
applied to all calls. 
Enabled 
Echo Canceller Mode 
Sets the echo canceller operating mode. 
Do not change the 
setting, which is 2. 
Echo Canceller Tail Length (ms) 
Specifies length of echo canceller in msec  16 
Fax Transmission Mode 
Control for FAX processing method: Off, 
or Passthrough (μLaw or ALaw)  
Off 
DTMF Transmission Method 
Control for DTMF processing method: Off, 
Audio Passthrough, RTP Out-of-band, 
SIP Out-of-band 
RTP Out-of-band 
iLBC High Rate Enable 
Enables 15.2 kbps / 20 ms frames. When 
disabled, 13.33 kbps / 30 ms frames. 
Many implementations negotiate 13.33 
kbps / 30 ms only. 
Disabled 
Chapter 5:  VoIP Parameters
                                                                                                                           
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