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HandyTone-488 User Manual Grandstream Networks, Inc.
24
DTMF Payload
Type
This parameter sets the payload type for DTMF using RFC2833
Preferred
Vocoder
The HandyTone ATA supports up to 7 different Vocoder types including
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
TX
This field contains the number of voice frames to be transmitted in a
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
type:
This defines payload time for iLBC. Default value is 98. The valid range
is between 96 and 127.
Silence
Suppression
This controls the silence suppression/VAD feature of G723 and G729. If
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”.