Snom 190 - Manual (Page 86)

86 • Call Register
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If you have configured a “music on hold” server, specify that
contact here. Music from this server will be played to the other side when
you hold a call.
Use user=phone
Turn this setting on if you want to use user=phone in SIP urls.
Otherwise select “off” to disable it.
Publish Presence
Control the presence status information through this setting.
Refer-To Brackets
To switch on or off additional brackets in the signaling for Refer-
To
Require PRACK
To force the usage of PRACK choose “on” here.
Symmetrical RTP
If you want to use symmetrical RTP switch it “on” here.
UPDATE
Update Policy
You can select the best possible update policy you would like to
adopt for your phone.
Setting URL
Set up the url of the settings server from where you would like to
obtain the configuration file to configure your phone.
VLAN
ID and Priority
5