AASTRA 7446ip (5446ip) for MD Evolution User Guide EN - Manual (Page 44)

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It may also consist of an external number containing up to 18 digits, including
the network access prefix. This may be an external number that is accessible
through abbreviated dialing.
You may use fixed call forward defined by your system administrator. This
may consist of a call forward on no-answer condition, a call forward on busy
condition, or a call forward on no answer and busy conditions.
This fixed call forward is applied by default whenever you do not define a
variable call forward for your calls. This is often the case when your facility
uses the integrated voice mail service, which - by default - receives your calls
encountering a no-answer or busy condition.
You may define all of the types of call forwards listed above, on your own. This
is referred to as a variable call forward that takes precedence over a possible
fixed call forward.
In any case, only one call forward applies at any given moment. Defining a new
variable call forward automatically cancels any definition that previously existed.
A variable call forward is defined on a case by case basis before you leave your
extension. If you forget to define the call forward, you may ask the attendants
to remotely define it for you. You may also define your call forward from an
internal extension other than your own phone that will be the recipient of your
call forwards. This is the Follow me service.
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