Multi-Tech Systems MVPGSM-2 manual Coder Parameters, Net Coder @, 711, G.729, 729, G.711

			Chapter 4: Configuring your MVPGSM
		Voice/Fax Parameter Definitions (continued)
	Coder Parameters
Coder		Manual or	Determines whether selection of coder is manual or automatic.
		Automatic	When Automatic is selected, the local and remote voice
			channels will negotiate the voice coder to be used by selecting
			the highest bandwidth coder supported by both sides without
			exceeding the Max Bandwidth setting. G.723, G.729, or G.711
			are negotiated.
Selected Coder		G.711 a/u law 64 kbps;	Select from a range of coders with specific bandwidths. The
		G.726, @ 16/24/32/40 kbps;	higher the bps rate, the more bandwidth is used. The channel
		G.727, @ nine bps rates;	that you are calling must have the same voice coder selected.
		G.723.1 @ 5.3 kbps, 6.3 kbps;	Default = G.723.1 @ 6.3 kbps. Here 64K of digital voice is
		G.729, 8kbps;	compressed to 6.3K, allowing several simultaneous
		Net Coder @	conversations over the same bandwidth that would otherwise
		6.4, 7.2, 8, 8.8, 9.6 kbps	carry only one.
			To make selections from the Selected Coder drop-down list, the
			Manual option must be enabled.
Selected Coder		G.711, G.729	Coder Priority has two options (G.711,G.729 or G.729, G711) on
additional		-or-	the Selected Coder listing of the Coder group on the Voice/Fax
choices		G.729, G.711	screen. If G.711 is the higher priority, i.e., G.711 is preferred to
			G729 on the sending side, then G.711, G.729 option is selected.
			Similarly, if G.729 has the higher priority, then G.729, G.711
			option is selected.
			It is used whenever a user wants to advertise both G.711 and
			G.729 coders with higher preference to a particular coder.
			It is useful when the calls are made from a particular channel on
			the VOIP to two different destinations where one supports
			G.711 and the other supports G.729.
Max bandwidth		11 – 128 kbps	This drop-down list enables you to select the maximum
(coder)			bandwidth allowed for this channel. The Max Bandwidth drop-
			down list is enabled only if the Coder is set to Automatic.
			If coder is to be selected automatically (“Auto” setting), then
			enter a value for maximum bandwidth.
Advanced Features
Silence		Y/N	Determines whether silence compression is enabled (checked)
Compression			for this voice channel.
			With Silence Compression enabled, the MultiVOIP GSM will not
			transmit voice packets when silence is detected, thereby
			reducing the amount of network bandwidth that is being used
			by the voice channel (default = on).
Echo		Y/N	Determines whether echo cancellation is enabled (checked) for
Cancellation			this voice channel.
			Echo Cancellation removes echo and improves sound quality
			(default = on).
Forward Error		Y/N	Determines whether forward error correction is enabled
Correction			(checked) for this voice channel.
			Forward Error Correction enables some of the voice packets
			that were corrupted or lost to be recovered. FEC doubles the
			overhead to the total network bandwidth consumed by the
			voice channel (default = Off).
Table is continued on next page…

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