 To configure the device's coders:
1. Open the Coders page (Configuration tab > VoIP menu > Coders and Profiles
submenu > Coders).
Figure 18-1: Coders Table Page
2. From the 'Coder Name' drop-down list, select the required coder.
3. From the 'Packetization Time' drop-down list, select the packetization time (in msec)
for the selected coder. The packetization time determines how many coder payloads
are combined into a single RTP packet.
4. From the 'Rate' drop-down list, select the bit rate (in kbps) for the selected coder.
5. In the 'Payload Type' field, if the payload type (i.e., format of the RTP payload) for the
selected coder is dynamic, enter a value from 0 to 120 (payload types of 'well-known'
coders cannot be modified).
6. From the 'Silence Suppression' drop-down list, enable or disable the silence
suppression option for the selected coder.
7. Repeat steps 2 through 6 for the next optional coders.
8. Click Submit.
9. To save the changes to flash memory, see 'Saving Configuration' on page 324.
The table below lists the supported coders:
Table 18-1: Supported Coders
Coder Name Packetization Time
(msec)
Rate (kbps) Payload
Type
Silence
Suppression
G.711 A-law
[g711Alaw64k]
10, 20 (default), 30, 40,
50, 60, 80, 100, 120
64 8
 [0] Disable
 [1] Enable
G.711 U-law
[g711Ulaw64k]
10, 20 (default), 30, 40,
50, 60, 80, 100, 120
64 0
 [0] Disable
 [1] Enable
G.711A-law_VBD
[g711AlawVbd]
10, 20 (default), 30, 40,
50, 60, 80, 100, 120
64 Dynamic (0-
127)
Default is
180
N/A
G.711U-law_VBD
[g711UlawVbd]
10, 20 (default), 30, 40,
50, 60, 80, 100, 120
64 Dynamic (0-
127)
Default is
120
N/A
G.722
[g722]
20 (default), 40, 60, 80,
100, 120
64 (default) 9 N/A
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