
64 Chapter 2 System telephony networking overview
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Restrictions by telephone type
• model 7000 telephone — associated LED or LCD flashes, and a tone is heard (model 7000
phones, supported in Europe only.)
• ATA2/ASM8+—Call Offer is supported as a Camp On feature, and a tone is heard
• ISDN—not supported
Note the following general conditions and restrictions:
• DND on busy must be selected (DN > Capabilities and Preferences > Capabilities tab) for a
telephone to accept Call Offer.
• If CF on busy is programmed for the telephone, Call Offer is not accepted.
• The target line for the telephone must be set to: If busy: busy tone, which is the default.
• Call Offer does not work if sent over Manual answer lines. It is recommended that the lines be
left at the default: Auto.
User actions
The party receiving a Call Offer has three choices:
• Ignore it. After a programmed time interval, the Offer request is removed.
• Reject it. If the user activates Do Not Disturb on Busy (DND) when the Call Offer request is
made, the request is removed from the telephone. The calling party is informed of the
rejection.
• Accept it. The Offer is accepted by releasing the active call.
Route optimization
Route Optimization is a DPNSS 1 feature for BCM that allows calls to follow the optimum route
between two end PBXs. This allows efficient use of network resources.
Route Optimization is initiated by the system and is transparent to the user. However, the user may
see a call switch from an appearance on the telephone to another appearance key or from an
intercom button to the appearance key or vice versa. This occurs when BCM receives a Route
Optimization request and initiates a new call to follow the optimal route.
If a telephone is active on a private line call, the Route Optimization call being established may go
on a public line. This will cause a loss of privacy on that line.
Data calls are rejected by Route Optimization in order to ensure the data transmission is not
affected.
Note: A call cannot be offered to a telephone with DND active. The line
indicator for external incoming calls still flashes.
Note: Forward on Busy takes priority over DND on Busy. Call Offer cannot
be accepted by putting an active call on hold.
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