Talkswitch 48-CA User Manual page 41

In the "Phone numbers" section:
All VoIP Lines are active when the system is first configured. Up to 3 phone numbers
can be assigned to each VoIP line for internal calling. Phone numbers need to be
assigned so that inbound VoIP calls can be handled according to the configuration
parameters set for VoIP lines under the Call Handling section. Phone numbers can be 1
or more digits in length.
Phone numbers 250-299 have special functionality with TalkSwitch. These numbers
can be directly dialed from any extension or Auto Attendant and will be automatically
routed via VoIP to the destination that has the number assigned to one of its ports. An
administrator should keep track of all phone numbers assigned to each location to
prevent duplicate numbers being assigned to multiple locations. We recommend that
you use these numbers as it will facilitate calling from extensions and the Auto
Attendants.
Busy Forwarding Options:
This section allows you to configure how inbound calls are handled for each port
when it is busy. You can click 'Assign ports' to assign ports for busy forwarding when
the port associated to this phone number is busy. This feature is similar to the
phone company's Rollover/Busy Forwarding service. By default this feature is
enabled so that the maximum number of inbound calls can be handled by the
system at any one time.
C o n f i g u r i n g T a l k S w i t c h 3 5