[CO Line Call to an Extension Not Answered, Forwarded to Mailbox (Extension Number
Method)]
PBX-1
TIE Line Network
Private network
PBX-2
Outside Caller
PBX-3
PBX-4
PBX-5
PBX-6
PBX-7
Telephone Company
Extn. 201
Fwd to VPS
PBX-8
Extn.
101
Extn.
202
VPS
Mailbox 101
Mailbox 201
Mailbox 202
Mailbox 201:
"Hello. I am not at
my desk right now."
[Explanation]
Extension
201 does not answer the CO line call, so the call is forwarded to the VPS, and answered by mailbox
201. If the outside caller leaves a message, the VPS 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, etc.) along with
the VM 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.
246 Feature Manual Document Version 2010-11
13.1.14 Private Network Features—Centralized Voice Mail
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