PLANET VIP-350PT User Manual
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Preferences
Prioritize between the available CODECs. CODECs will be listed based on their priorities. The smaller
the value is, the higher the priority would be. Those disabled voice CODECs, which preference is zero,
will be listed last. Note, however, if you disable all CODECs, it will auto-arrange the available CODECs
and those come with lower bit-rates take precedence. Besides, you should just lower the priorities of
G.711 in most circumstances rather than overly disabling them such that the phone could gracefully fall
back to G.711A or G.711μ when the peer does not support those low bit-rate CODECs for voice
compression.
Default is “Increasing voice quality”: Those come with higher compressed voice quality take
precedence. Such that it will prioritize those CODECs with the highest compressed voice quality first
while making calls. However, it will respect the peer’s preferences while taking calls.
[Up]
Increase the priority of selected CODEC
[Down]
Decrease the priority of selected CODEC
[ ]
Disable selected CODEC
[Back]
Return without any changes.
【
OK】
Save changes and return.
【
↑】and【↓】 Navigate through menu items.
CODEC Priority List Format: list by priority with most preferred first.
1
.
G .
7
1
1 A
-
6
4
k
:
1
2
.
G .
7
1
1 μ
-
6
4
k
:
2
3
.
G .
7
2
3 .
1
-
6
.
4
k
:
3
4
.
G .
7
2
6 -
4
0
k
:
4
5
.
G .
7
2
6 -
3
2
K
:
5
6
.
G .
7
2
9 -
8
k
:
6
7
.
G .
7
2
3 .
1
-
5
.
3
k
:
Up
Down
Back
Packetization
Configure the default voice packetization transmitted to the peer. The terminal will adjust the audio
frames carried per RTP packet (voice packetization) based on this setting:
Voice Packetization
G.723.1
G.729
G.711
30(G.723.1)/10(Others)-ms
LAN
1 Frames (10 ms)
30(G.723.1)/20(Others)-ms
xDSL, ISDN
2 Frames (20 ms)
30(G723.1)/30(Others)-ms
xDSL, ISDN, Cable
3 Frames (30 ms)
30(G.723.1)/40(Others)-ms
56 kbps MODEM
1 Frame (30 ms)
60(G.723.1)/40(Others)-ms
Limited bandwidth
2 Frames (60 ms)
4 Frames (40 ms)
The default is 『20/30(G.723.1)ms』: 1 audio frame (30 ms voice) per RTP packet for G.723.1 CODEC,
and 2 frames (20 ms voice) per packet for all other CODECs such as G.729A and G.711.
Before changing this setting, please refer to the following table “Packet Rate and VoIP Bandwidth
Consumption” to find out the optimal value fit into your environment. We suggest a reasonable
packetization should NOT longer than 40 milliseconds. Pick the longer packetization time unless you
have a very limited bandwidth access at the expense of more latency.