Cisco SPA112 Administration Guide - Page 91

SIP Settings, medium, very high, extremely high, SIP 100REL Enable - network jitter level

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Configuring Voice Configuring Voice Settings 4 Field Network Jitter Level Jitter Buffer Adjustment SIP Settings Description Determines how jitter buffer size is adjusted by the ATA. 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. Default setting: high. Choose yes to enable or no to disable this feature. Default setting: yes Field SIP Transport SIP Port SIP 100REL Enable EXT SIP Port Description The TCP choice provides "guaranteed delivery", which assures that lost packets are retransmitted. TCP also guarantees that the SIP packages are received in the same order that they were sent. As a result, TCP overcomes the main disadvantages of UDP. In addition, for security reasons, most corporate firewalls block UDP ports. With TCP, new ports do not need to be opened or packets dropped, because TCP is already in use for basic activities such as Internet browsing or e-commerce. Options are: UDP, TCP, TLS. Default setting: UDP. Port number of the SIP message listening and transmission port. Default setting: 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. Default setting: no. The external SIP port number. Cisco SPA100 Series Phone Adapters Administration Guide 91

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Configuring Voice
Configuring Voice Settings
Cisco SPA100 Series Phone Adapters Administration Guide
91
4
SIP Settings
Network Jitter Level
Determines how jitter buffer size is adjusted by
the ATA. 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
. Default setting: high.
Jitter Buffer Adjustment
Choose yes to enable or no to disable this
feature. Default setting: yes
Field
Description
SIP Transport
The TCP choice provides “guaranteed delivery”,
which assures that lost packets are
retransmitted. TCP also guarantees that the SIP
packages are received in the same order that
they were sent. As a result, TCP overcomes the
main disadvantages of UDP. In addition, for
security reasons, most corporate firewalls block
UDP ports. With TCP, new ports do not need to
be opened or packets dropped, because TCP is
already in use for basic activities such as Internet
browsing or e-commerce. Options are:
UDP
,
TCP
,
TLS
.
Default setting: UDP.
SIP Port
Port number of the SIP message listening and
transmission port. Default setting: 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
. Default setting: no.
EXT SIP Port
The external SIP port number.
Field
Description