VoIP profile configuration task list
578
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
VoIP
ISDN
ISDN
Sequential post filtering
Node
Node
PSTN
Node
Node
Node
Node
Node
Node