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SIP Settings
This section defines SIP-related settings.
•
Use Short SIP Headers: Some SIP headers have a short form (e.g., the
header gets shortened to
Short headers have the advantage of saving space in the messages, reducing
overall probability of running into problems with maximum message size in
UDP. Although it is quite simple to support this, some devices do not sup-
port short headers. For this reason, the system offers both short and long. To
maximize interoperability, keep the default value (long). If you are running
into UDP packet fragmentation problems (message size above 1492 bytes),
switch to the short header form.
•
Listen to sip.mcast.net: SIP has its own multicast group according to
RFC 3261. A SIP device usually knows where to send requests, but during
bootup and configuration, a user agent might want to locate the system with
a multicast request. If this setting is turned on and you are using user agents
with the multicast detection feature, you can just plug the devices into the
network and they will get their configuration information automatically from
the system if the system PnP settings have been configured (see Chapter 20).
Changing the Listen to sip.mcast.net setting requires a system restart.
•
Allow domain admin to change trunks: In hosted environments, the service
provider might want to set up the trunks and then hide them from domain
administrators. When this feature is set to No, domain administrators will be
unable to edit or view trunks.
Chapter 2: System Settings
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, the
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