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ATA Voice Field Reference
PSTN Line page (SPA3102)
ATA Administration Guide 193
B
Voice tab > PSTN Line page >
SIP Settings section
Network Jitter
Level
Determines how jitter buffer size is adjusted by the ATA
device. 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.
Jitter Buffer
Adjustment
Controls how the jitter buffer should be adjusted. Select
the appropriate setting: up and down, up only, down only,
or disable.
The default is up and down.
SIP Port Port number of the SIP message listening and transmission
port.
The default is 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.
The default is no.
EXT SIP Port The external SIP port number.
Auth Resync-
Reboot
If this feature is enabled, the ATA device authenticates the
sender when it receives the NOTIFY resync reboot (RFC
2617) message. To use this feature, select yes. Otherwise,
select no.
The default is yes.
SIP Proxy-Require The SIP proxy can support a specific extension or behavior
when it sees this header from the user agent. If this field is
configured and the proxy does not support it, it responds
with the message, unsupported. Enter the appropriate
header in the field provided.