There is a way to configure an announcement before answer that can be set up thru call forwarding to play and then forward the call on. You could forward the call on to a call processing mailbox on your voicemail if you have one. I'm attempting to copy the manual pages here:
7.6.10 Announcement Before Answering
Definition
This feature plays an announcement for external callers from an optional external
announcement device. This applies to both analog and digital trunks.
The announcement can be played either parallel to ringing or only if the call is placed
in the announcement device queue. The announcement begins after a programmable
period and can be heard by several callers simultaneously.
Users can configure an announcement before answering to relieve an intercept
station. For this purpose, users connect an announcement device, which is capable
of answering an incoming call and forwarding it to a specific station. This feature is
configured with call management.
Users must configure the subscriber ports that connect to announcement devices as
answering machines. If the announcement device is connected to an analog port and
it must be able to present an open loop to the system at the end of the message.
The UCD feature can also be used to start the announcement only after a
programmable period. The announcement can be heard by several callers
simultaneously.
The feature can be used to present callers with a company message before being
answered, for example, by the Attendant or by a group.
Model-Specific Data
Subject Pro Com Point One
(not for
U.S.)
Start
(not for
U.S.)
Feature available in x x x x x
HW requirements TIEL or
anlaog
port
Analog port
SW requirements Rel. 1.0 or later
No. of callers who can
hear an announcement
simultaneously
30 30 30 30 30
Features for Incoming External Traffic
Implementing Features
G281-0666-01, August 2000
7-194 Hicom 150 E Office, Rel. 2.0-3.0, Service Manual
Requirements and Conditions
Configuration Options
This feature can be configured using Hicom Assistant T or Hicom Assistant E Office.
Configuring the Feature Using Hicom Assistant T
Configure the feature using Hicom Assistant T as follows:
Configuring the Feature Using Hicom Assistant E Office
Configure the feature using Hicom Assistant E Office as follows:
Testing the Feature
Check the feature for error-free functioning as follows:
Subject Requirement or Condition
Group/station If the announcement port is entered as a call forwarding—
no answer destination, the appropriate announcement is
played if the group or station is busy. The call is then forwarded
to the next station or the programmed intercept criteria
apply.
Step Action
1. Configure announcement before answering
2. 25-1 => Announcement device - Announcement device
3. 25-2 => Announcement device - Announcement type
4. 25-3 => Announcement device - Ann. before answer
Step Action
1. Configure announcement before answering
Options
2. Connections
3. Announcement equipment
Step Action
1. Configure announcement before answering.
2. Dial the system from an external telephone.
3. The announcement plays.
Sorry if it looks really bad.....