Panasonic KX-NS500 Features Manual page 456

4.3.5 QSIG Enhanced Features
[Trunk Call to an Extension Not Answered, Forwarded to Mailbox (Extension Number
Method)]
PBX-1
Mailbox 101
Mailbox 201
Mailbox 202
Unified Messaging
Extn.
101
[Explanation]
Extension 201 does not answer the trunk call, so the call is forwarded to the Unified Messaging system and
answered by mailbox 201. If the outside caller leaves a message, the Unified Messaging system sends a
Message Waiting notification to the extension using Enhanced QSIG information over the private network.
When forwarding the call, PBX-2 sends any received call information (Caller ID number/name, DDI number)
along with the trunk group number to use, applicable time mode, and extension number and forwarding reason
of the original destination extension to PBX-1 as Enhanced QSIG information.
456 Feature Guide
Telephone Company
PBX-2
Private network
Mailbox 201:
"Hello. I am not at
my desk right now."
Extn. 201
Fwd to Unified
Messaging
Outside Caller
TIE Line Network
PBX-3
PBX-4
PBX-5
PBX-6
PBX-7
PBX-8
Extn.
202