Cisco 501G Administration Manual page 94

Configuring SIP, SPCP, and NAT
Configuring SIP
STEP 5
Cisco SPA500 Series and WIP310 IP Phone Administration Guide
Parameter
Network Jitter Level
Jitter Buffer
Adjustment
Under SIP Settings, configure the following fields:
Parameter
SIP Transport
SIP Port
SIP 100REL Enable
EXT SIP Port
Auth Resync-Reboot
Description
Determines how jitter buffer size is adjusted by the SPA9000.
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.
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.
Description
Select from UDP, TCP, or TLS.
Defaults to UDP.
Port number of the SIP message listening and transmission
port.
Defaults to 5060.
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.
The external SIP port number.
If this feature is enabled, the Cisco IP phone authenticates the
sender when it receives the NOTIFY resync reboot (RFC 2617)
message. To use this feature, select yes. Otherwise, select no.
Defaults to yes.
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