Grandstream Networks HandyTone-486 User Manual page 25

HandyTone-486 User Manual
Preferred Vocoder
G723 Rate:
iLBC frame size:
iLBC payload type: Payload type for iLBC. Default value is 97. The valid range is between 96 and
Silence Suppression This enables/disables the silence suppression/VAD feature of G723 and G729.
Voice Frames per
TX
Fax Mode
Layer 3 QoS
Layer 2 QoS (
VoIP)
Layer 2 QoS ( PC)
The HandyTone ATA supports 6 different codec types including G.711 A/U
law，G.723.1, G.726, G.729A/B, iLBC.
A user can configure Codecs in a preference list that will be included with the
same preference order in SDP message.
Encoding rate for G723 codec. By default, 6.3kbps rate is set.
iLBC packet frame size. Default is 20ms. For Asterisk PBX, 30ms might be
required.
127.
If set to "Yes", when a silence is detected, small quantity of VAD packets
(instead of audio packets) will be sent during this period. If set to "No", this
feature is disabled.
This field contains the number of voice frames 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 codec in the above codec Preference List or the
actual used payload type negotiated between the 2 conversation parties at run
time.
e.g., if the first codec 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 codec 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 codec choice. The maximum value for PCM is 10(x10ms)
frames. For G726, it is 20 (x10ms) frames. And 32 (x30ms) and 64 (x10ms)
frames for G723 and G729 respectively.
T.38 (Auto Detect) FoIP by default, or fax Pass-Through.
This field defines the layer 3 QoS parameter which can be the value used for IP
Precedence or Diff-Serv or MPLS. Default value is 48.
Layer 2 QoS settings for VoIP traffic. Default setting is blank. VLAN
supported equipment is required if user needs to change these settings.
Layer 2 QoS settings for LAN port device traffic. Default setting is blank.
VLAN supported equipment is required if user needs to change these settings.
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Grandstream Networks, Inc.