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Configuring the Voice Settings
PSTN (LINE Port)
Cisco SPA232D Administration Guide 127
4
SIP Settings
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.
O p t i o n s a r e : U D P, TC P, T L S . T h e d e f a u l t i s U D P.
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.
Default setting: 5061
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.
Default setting: blank
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.
Default setting: yes