Nortel Networks Mediant TP-1610 SIP - Manual (Page 44)

Mediant 2000 SIP
Mediant 2000 SIP User’s Manual 44 Document #: LTRT-72504
5.8 Protocol Management
Use this menu to configure the gateway’s SIP parameters and tables.
5.8.1 Protocol Definition Parameters
Use this submenu to configure the following gateway’s specific SIP protocol parameters:
• General Parameters
• Proxy & Registration Parameters
• Coders (refer to Section 5.8.1.1 below)
• DTMF & Dialing Parameters
5.8.1.1 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.
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 5-3: 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 the ini file parameter ‘CoderName’
(described in
Table 6-3 ).
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 (Real-Time Transport Protocol) (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 5.12 on page
84 .
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.