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Linksys IP Phone Administrator Guide
Firmware Version 5.1
Chapter 5 Linksys IP Phone Field Reference
Ext Tab
SIP Settings
Note Some of the parameters in this section do not apply to the WIP310 wireless phone. Only the SIP Port
and SIP Debug Option parameters apply to the SPA901.
Field Description
SIP TOS/DiffServ Value TOS/DiffServ field value in UDP IP packets carrying a SIP message.
Defaults to 0x68.
SIP CoS Value CoS value for SIP messages.
Defaults to 3.
RTP TOS/DiffServ Value ToS/DiffServ field value in UDP IP packets carrying RTP data.
Defaults to 0xb8.
RTP CoS Value CoS value for RTP data.
Defaults to 6.
Network Jitter Level Determines how jitter buffer size is adjusted by the Linksys IP 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.
Defaults to high.
Jitter Buffer Adjustment Controls how the jitter buffer should be adjusted. Select the appropriate setting: up and
down, up only, down only, or disable.
Defaults to up and down.
Field Description
SIP Transport Select from UDP, TCP, or TLS.
Defaults to UDP.
SIP Port Port number of the SIP message listening and transmission port.
Defaults to 5060.
SIP 100REL Enable To enable the support of 100REL SIP extension for reliable transmission of provisional
responses (18x) and use of PRACK requests, select yes. Otherwise, select no.
Defaults to no.
EXT SIP Port The external SIP port number.
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