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Chapter 5
900 Series phone Field Reference
NAT Settings
Field
NAT Mapping Enable
NAT Keep Alive Enable
NAT Keep Alive Msg
NAT Keep Alive Dest
Network Settings
Field
SIP ToS/DiffServ Value
SIP CoS Value [0-7]
RTP ToS/DiffServ Value
RTP CoS Value [0-7]
Network Jitter Level
Document Version 3.1
Description
To use externally mapped IP addresses and SIP/RTP ports in SIP messages, select yes.
Otherwise, select no.
The default is no.
To send the configured NAT keep alive message periodically, select yes. Otherwise, select
no.
The default is no.
Enter the keep alive message that should be sent periodically to maintain the current
NAT mapping. If the value is $NOTIFY, a NOTIFY message is sent. If the value is
$REGISTER, a REGISTER message without contact is sent.
The default is $NOTIFY.
Destination that should receive NAT keep alive messages. If the value is $PROXY,
the messages are sent to the current or outbound proxy.
The default is $PROXY.
Description
TOS/DiffServ field value in UDP IP packets carrying a SIP message.
The default is 0x68.
CoS value for SIP messages.
The default is 3.
ToS/DiffServ field value in UDP IP packets carrying RTP data.
The default is 0xb8.
CoS value for RTP data.
The default is 6.
Determines how jitter buffer size is adjusted by the 900 Series phone. Jitter buffer size is
adjusted dynamically. The minimum jitter buffer size is 30 milliseconds or (10
milliseconds + current RTP frame size), whichever is larger, for all jitter level settings.
However, the starting jitter buffer size value is larger for higher jitter levels. This setting
controls the rate at which the jitter buffer size is adjusted to reach the minimum. Select
the appropriate setting: low, medium, high, very high, or extremely high.
The default is high.
Linksys 900 Series IP Phone Administrator Guide
Ext 1/2/3/45/6 Tab
5-37
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