Chapter 1: Product Description and Specifications
Prerequisite: Ordering the DID Line
To operate the CallFinder system, you will need two DID (Direct Inward Dial) lines in your office. You must order the DID line from your local telephone operating company (telco). A DID line allows one phone line to be associated with multiple directory numbers. However, only one call can occur on this line at any given time.
DID lines are sold in groups. For example, a telco in New York City might offer a DID line with a set of 20 directory numbers in the range of
When ordering your DID line(s), ask the telco representative for these details about the DID service. These details will be important when setting up your CF220 DID Adapter.
Parameter | Value Required by |
| Telco |
Number of digits used
to designate the DID extension (usually 3, 4, 6, or 7)
Type of “DID Start” used (wink, immediate, or delay dial)
You will need this information to configure your CallFinder DID Adapter (see Chapter 3: CallFinder Server Installation).
Safety Warnings
•Use this product only with UL- and
•Caution: this unit has two power adaptors. To disconnect power from the unit, both power cords must be removed to avoid electrical shock.
•Never install phone wiring during a lightning storm.
•Never install a phone jack in a wet location unless the jack is specifically designed for wet locations.
•Never touch uninsulated phone wires or terminals unless the phone line has been disconnected at the network interface.
•Use caution when installing or modifying phone lines.
•Avoid using a phone during an electrical storm; there is a risk of electrical shock from lightning.
•Do not use a phone in the vicinity of a gas leak.
•To reduce the risk of fire, use only 26 AWG or larger telephone line cord.
CF220 CallFinder User Guide | 6 |
