The unit should be connected to the telephone lines coming into your building commonly known as the Central Office or “CO” lines. These lines are otherwise referred to as flat rate, local loop, or 1FB lines. The unit can also operate on analog Centrex™ lines. If the internal jumpers reconfigured to current detection mode, it can also operate on trunk lines (or “ground start” lines). It will not work connected directly to digital Centrex™, T1, or ISDN lines. If you have an ISDN interface hardware that has analog telephone outputs. Outbound monitoring is possible. Also, the unit can monitor outbound calls when placed on analog extensions from a telephone switch. See Table 1 for telephone line type compatibility.
Depending on the type of phone line, the unit may be compatible with Caller ID and outbound call monitoring, or just outbound call monitoring only. The unit senses On/Off Hook by detecting the telephone line voltage levels. If the voltage levels are not in standard local loop ranges, the unit can be configured to detect On/Off Hook by means of current flow through the device (see Part V, “Supplemental Information”). For additional information on voltage vs. current detection please refer to Appendix A, Voltage Vs. Current Detection of On and Off Hook
Table 1. Phone Line Compatibility
| Caller ID Capture | Outbound Calls | On/Off Hook Detect | |
|---|---|---|---|
| Standard Local Loop (1FB) | Yes | Yes | Voltage or Current |
| Analog Centrex | Yes | Yes | Voltage or Current |
| Ground Start (Trunk) | Yes | Yes | Current Only |
| ISDN Interface w/ Analog Ports | Yes, if interface generates analog Caller ID | Yes, though analog ports only | Current Only |
| Switch Analog Extensions | No | Yes | Current Only |
| Switch Digital Extensions | Not Compatible | Not Compatible | Not Compatible |
| ISDN, T1[a], Digital Centrex | Not Compatible | Not Compatible | Not Compatible |
[a] T1 circuits terminated with external routers capable of separating and combining Voice and Data are, in fact, compatible with Whozz Calling? units. These routers supply standard analog 1FB lines to the phone system. | |||
In order to capture Caller ID, an analog Caller ID signal must present on the phone line. This signal can be sent directly from the phone company or certain types of ISDN interface units can regenerate digital Caller ID data as analog Caller ID signals to its analog ports. Analog Caller ID will not pass through telephone switches to extension lines. Even Caller ID compatible telephone switches do not pass or regenerate analog Caller ID signals to extensions lines. This unit will not operate if directly connected to digital phone lines or digital extensions.
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