Configuring SIP, SPCP, and NAT
Configuring SIP
102 Cisco SPA and Wireless IP Phone Administration Guide
5
STEP 5 Under SIP Settings, configure the following fields:
RTP CoS Value [0-7] CoS value for RTP data.
Defaults to 6.
Network Jitter Level 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.
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.
Parameter Description
Parameter 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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