innovaphone IP DECT Page 75
The standard entry fields in the Coder Preferences section are:
Registration section:
Model The
Model
list box allows you to select the coder to be
used. The coders available for selection are:
G711A
,
G711u
,
G723-53
,
G729A
,
G726-32
and
XPARENT.
If the remote VoIP device does not support the set coder,
a commonly supported coder is used, unless the
Exclu-
sive
check box was enabled.
Frame Determines the packet size used in transmitting voice
data (in ms). Larger packets cause a greater delay in
voice data transmission, but cause less load on the net-
work, since the
overhead
involved in transporting the
packets in the network is lower. The higher the packet
size used, the lower the bandwidth effectively used.
Encoding method | Packet size | Bandwidth
G.711 | 30ms | 77kb
G.711 | 90ms | 68kb
-------------------------------------------------------
G.729 | 30ms | 21kb
G.729 | 90ms | 12kb
Exclusive A checked check box enforces the set encoding (
Model
),
regardless of whether it is supported by the remote VoIP
device.
SC A checked check box enables SC (Silence Compression).
With SC, no data is transmitted during pauses in the con-
versation. This also allows bandwidth to be saved wit-
hout quality loss.
Enable T.38 A checked check box enables the
T.3 8
Fax-over-IP proto-
col. If a fax machine was connected to the relevant inter-
face, then this check box must be enabled; otherwise,
fax transmissions are not handled.
Enable PCM A checked check box enables the PCM switch (Pulse
Code Manipulation). Calls from one interface to another
interface are then handled directly over the ISDN PCM
bus, which in turn saves DSP channels. This entry field is
optional and is displayed only in particular devices.
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