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5.1 Guidelines for Inband Integration
154 Installation Manual
3. Checks to see if the called subscriber is in, out, or on another line, and whether or not that
subscriber accepts the transfer.
4. Completes the transfer (by going on-hook) or notifies the caller that the party is busy or not
available. It then gives the caller an opportunity to leave a message.
If the PBX does not provide screened transfer from an SLT, the VPS cannot give callers the option to
leave a message in a subscriber's mailbox.
Follow-on ID or Called Party ID
When forwarding or transferring a call to the VPS, a PBX with Follow-on ID sends the mailbox number
of the called subscriber to the VPS before connecting the caller. The VPS responds by playing that
subscriber's personal greeting. This operation is sometimes called Call Forward to Mailbox. Without
this feature, the VPS cannot immediately play the called extension's greeting message when the line
is busy or there is no answer because the VPS does not know which mailbox to send the caller to.
TEST: Place a trunk call from an SLT. See if you can set up a screened
transfer to another extension. Next, try the same test with an intercom call.
(The VPS may have to transfer both types of calls.)