Grandstream Networks HandyTone-488 Dtmf Payload, Type Preferred, Vocoder, Voice Frames per

HandyTone-488 User Manual		Grandstream Networks, Inc.
DTMF Payload	This parameter sets the payload type for DTMF using RFC2833
Type
Preferred	The HandyTone ATA supports up to 7 different Vocoder types including
Vocoder	G.711 A-/U-law，G.723.1, G.726, G.728, G.729A/B, iLBC. Depending
	on the product model, some of these Vocoders may not be provided in
	standard release.
	Users can configure Vocoders in a preference list that will be included
	with the same preference order in SDP message. The first Vocoder in
	this list can be entered by choosing the appropriate option in “Choice 1”.
	Similarly, the last Vocoder in this list can be entered by choosing the
	appropriate option in “Choice 7”.
Voice Frames per	This field contains the number of voice frames to be transmitted in a
TX	single packet. When setting this value, the user should be aware of the
	requested packet time (used in SDP message) as a result of configuring
	this parameter. This parameter is associated with the first vocoder in the
	above vocoder Preference List or the actual used payload type
	negotiated between the 2 conversation parties at run time.
	e.g., if the first vocoder is configured as G723 and the “Voice Frames
	per TX” is set to be 2, then the “ptime” value in the SDP message of an
	INVITE request will be 60ms because each G723 voice frame contains
	30ms of audio. Similarly, if this field is set to be 2 and if the first vocoder
	chosen is G729 or G711 or G726, then the “ptime” value in the SDP
	message of an INVITE request will be 20ms.
	If the configured voice frames per TX exceeds the maximum allowed
	value, the HandyTone ATA will use and save the maximum allowed
	value for the corresponding first vocoder choice. The maximum value for
	PCM is 10(x10ms) frames; for G726, it is 20 (x10ms) frames; for G723,
	it is 32 (x30ms) frames; for G729/G728, 64 (x10ms) and 64 (x2.5ms)
	frames respectively.
G723 Rate:	This defines the encoding rate for G723 vocoder. By default, 6.3kbps
	rate is chosen.
iLBC frame size:	This sets the iLBC size in 20ms or 30ms
iLBC payload	This defines payload time for iLBC. Default value is 98. The valid range
type:	is between 96 and 127.
Silence	This controls the silence suppression/VAD feature of G723 and G729. If
Suppression	set to “Yes”, when a silence is detected, small quantity of VAD packets
	(instead of audio packets) will be sent during the period of no talking. If
	set to “No”, this feature is disabled.
SIP Registration	This parameter controls whether the HandyTone ATA needs to send
	REGISTER messages to the proxy server. The default setting is “Yes”.

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