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VoIP profile configuration task list 583
SmartWare Software Configuration Guide 47 • VoIP profile configuration
Mode: Profile VoIP
Enabling/disabling filters (advanced)
The voice decoder output is normally filtered through a perceptual post-filter to improve voice quality. Like-
wise a high pass filter is normally used to cancel noises at the coder input. When the communication channels
include several SmartNodes in tandem as shown in figure 5, sequential post filtering or high pass filtering can
cause degrade signal quality. In this case, the user can choose to disable the post-filter and the high-pass-filter.
Note Filtering only occurs with G.723 and G.729 codecs.
Figure 5. Multiple tandem and sequential post filtering
This procedure describes how to disable post-filtering and high-pass-filtering.
Mode: Profile VoIP
Example: Disable filters
The following example shows how to disable the decoder output post-filter and the input high-pass filter.
node>enable
node#configure
node(cfg)#profile voip myProfile
node(pf-voip)[myProfi~]#no post-filter
node(pf-voip)[myProfi~]#no high-pass-filter
Step Command Purpose
1 node(pf-voip)[name]#dejitter-mode mode Specify the dejitter buffer as adaptive, static or
static-data.
2 node(pf-voip)[name]#dejitter-max-delay
max-delay
Specify the maximum delay in milliseconds that the
dejitter buffer is allowed to introduce. This setting
is valid for all modes.
Step Command Purpose
1 node(pf-voip)[name]#no post-filter Disable decoder output filter
2 node(pf-voip)[name]#no high-pass-filter Disable decoder input high pass filter
VoIP VoIPISDN
ISD
N
Sequential post filtering
Node
Node
PSTN
Node
Node
Node
Node
Node
Node