Name: AudioCodes MP-124
Brand: AudioCodes
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SIP User's Manual 106 Document #: LTRT-65412

MP-11x & MP-124

¾ To configure the device's coders:

1. Open the 'Coders' page (Configuration tab > Protocol Configuration menu >

Coders And Profile Definition submenu > Coders page item).

Figure 3-63: Coders Page

2. From the 'Coder Name' drop-down list, select the required coder. For the full list of

available coders and their corresponding attributes, refer to the parameter CoderName

(refer to ''SIP Configuration Parameters'' on page 252).

3. From the 'Pa

cketization 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 for the selected coder is dynamic, enter

a value from 0 to 120 (payload types of 'well-known' coders cannot be modified). The

payload type identifies the format of the RTP payload.

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 second to fifth optional coders.

8. Click the Submit button to save your changes.

9. To save the changes to flash memory, refer to ''Saving Configuration'' on page 167.

Notes:

• Each coder (i.e., 'Coder Name') can appear only once.

• If packetization time and/or rate are not specified, the default value is

applied.

• Only the packetization time of the first coder in the coder list is declared

in INVITE/200 OK SDP, even if multiple coders are defined.

• For G.729, it's also possible to select silence suppression without

adaptations.

• If the coder G.729 is selected and silence suppression is disabled (for

this coder), the device includes the string 'annexb=no' in the SDP of the

relevant SIP messages. If silence suppression is enabled or set to

'Enable w/o Adaptations', 'annexb=yes' is included. An exception to this

logic is when the remote gateway is a Cisco device (IsCiscoSCEMode).

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