Patton electronic SmartNode 4110 Series manual Enabling/disabling filters advanced, Max-delay

SmartWare Software Configuration Guide47 • VoIP profile configuration

Mode: Profile VoIP

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	Specify the maximum delay in milliseconds that the
	max-delay	dejitter buffer is allowed to introduce. This setting
		is valid for all modes.

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.

Sequential post filtering

Node	Node	PSTN
Node	Node
ISDN	VoIP

NodeNode

VoIP

ISDN

Node

Node

Figure 5. Multiple tandem and sequential post filtering

This procedure describes how to disable post-filtering and high-pass-filtering.

Mode: Profile VoIP

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

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

VoIP profile configuration task list 583