MediaPack SIP User’s Manual 5. Configuring the MediaPack
Version 4.6 61 June 2005
5.5.1.3 Coders
From the Coders screen you can configure the first to fifth preferred coders (and their
corresponding ptimes) for the gateway. The first coder is the highest priority coder and is used by
the gateway whenever possible. If the far end gateway cannot use the coder assigned as the first
coder, the gateway attempts to use the next coder and so forth.
¾ To configure the Gateway’s coders, take these 6 steps:
1. Open the ‘Coders’ screen (Protocol Management menu > Protocol Definition submenu >
Coders option); the ‘Coders’ screen is displayed.
Figure
5-5: Coders Screen
2. From the coder drop-down list, select the coder you want to use. For the full list of available
coders and their corresponding ptimes, refer to Table
5-3.
Note: Each coder can appear only once.
3. From the drop-down list to the right of the coder list, select the size of the Voice Packet
(ptime) used with this coder in milliseconds. Selecting the size of the packet determines how
many coder payloads are combined into one RTP (voice) packet.
Note 1: The ptime packetization period depends on the selected coder name.
Note 2: If not specified, the ptime gets a default value.
Note 3: The ptime specifies the maximum packetization time the gateway can receive.
4. Repeat steps 2 and 3 for the second to fifth coders (optional).
5. Click the Submit button to save your changes.
6. To save the changes so they are available after a power fail, refer to Section
5.9 on page
161.
Note: Only the ptime of the first coder in the defined coder list is declared in INVITE
/ 200 OK SDP, even if multiple coders are defined.
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