Depaepe PXB41A Notice D'utilisation page 20

SecurAccess SIP Basic Line – User Guide
Preferred Vocoder In
listed order
Voice Frames Per TX
G723 Rate
iLBC mode
The SecurHD IP supports up to 7 different Vocoder types including
G.711 A-/U-law G.723.1, G.726, G.729A/B, G.722, iLBC, GSM_FR .
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".
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.
Examples : 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 SecurHD IP 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.
This defines the encoding rate for G723 vocoder.
By default, 6.3kbps rate is chosen.
from 96 to 127.
By default, it is 97
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