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snom technology AG • 93
[ SNOM 320 MANUAL V1.00 ]
6
Publish Presence: When this feature is set to “on”, the phone
sends out PUBLISH messages showing the phone’s status.
Refer-To Brackets: Switch additional brackets on or off in the
Signaling for Refer-To. As some devices rely on this setting, we are kind
enough to offer a solution!
Require PRACK: To force the use of PRACK, choose “on” here.
“PRACK” messages are used to acknowledge the receipt of “180 Ringing”
messages, which are usually not acknowledged. This helps, for example,
to inform gateways whether the phone has actually begun to ring.
Offer GRUU: This setting is used to toggle the support for GRUU
(Globally Routable User agent URLs) in SIP. When several phones have
the same account, each one of them can be identifi ed by the proxy through
this GRUU ID, which is unique for each phone and stays the same even
after reboot.
Offer MPO: Using this setting, the user can turn the Media
Path Optimization support on or off. Turning it on makes sense only
when you have MPO-supporting session border controller devices in your
environment (e.g., Jasomi).
Filter packets from Registrar: If set to “on”, all SIP packets not
coming from the registrar/proxy will be ignored. For security reasons,
“on” is the default setting. This may cause big problems in an environment
where SIP packets from other sources also have to be accepted for proper
functionality!
Authentication for SIP Reboot: This setting enables and disables
challenge responses for remote reboot requests.
Authentication for SIP Check-Sync: Turning this setting on
enables challenge responses for Check-Sync requests.
Use SIP Compact Headers: In order to use SIP compact header
notations, you can switch this functionality on here.