ArtDio IPS-3101h - Manual (Page 18)

User’s Manaul
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Preferred
Vocoder The BudgeTone IPS-3101h supports up to 6 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.
A user 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 6”.
G723 Rate: This defines the encoding rate for G723 vocoder. By default, 6.3kbps
rate is chose.
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.
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 IPS-3101h 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.
Layer 3 QoS 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 This contains the value used for layer 2 VLAN tag. Default setting is
blank.