VTech ET685 Administrator And Provisioning Manual page 129

Setting
Device Feature Key
Synchronisation
Refer-To Brackets
Check SDP Version
Check CSeq in Dlg Info
Notify
Web User Interface (WebUI) Reference
ET685 Administrator and Provisioning Manual
Description
Note: Since version 8.7.3.18 Identity-Based. Many SIP
phone users prefer to use the buttons on their phone to
activate features, such as Do Not Disturb (DND), rather than
any web portal. This feature permits these SIP phone users
to use the buttons on their phones in just this way. With this
feature installed, supported SIP phones can synchronize
with the Application Server on the status of the following
features:
Do Not Disturb

Call Forwarding Always (CFA)

Call Forwarding Busy (CFB)

Call Forwarding No Answer (CFNA).

If a user changes the status of one of these features via the
web portal or a feature access code (FAC), the Application
Server notifies the phone about the status change.
Conversely, if the user changes the feature status via a
button on his/her phone, the phone notifies the Application
Server of the status change. The synchronization protocol is
based on the SIP events framework. To use this capability,
the phone user must have a SIP phone that supports the
'as-feature-event" event package.
Switch additional brackets on or off in the Signaling for
Refer-To. Some devices rely on this setting. With Version
8.7.5 this setting splitted from being a global one, into one
for each registrartion
Usually each received sdp-packet has a version number
that identifies it. When receiving the same version again the
phone can ignore it. However this versioning mechanism
does not work reliably with all PBX'es so we introduced the
option to keep the phone from checking the version. When
version check is off, the phone will compare the entire sdp
instead (except for the version). When setting
user_server_type to nortel, ocs or broadsoft ->
version-check will be disabled automatically.
So as to prevent an incorrect LED status, a NOTIFY
transporting a dialog-info event will be proceesed only if is
not stale (i.e. the CSeq number in the NOTIFY request is
greater than the last one received). Disable this setting if
you want the CSeq counter to be ignored.
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