Qualcomm GSP-2900 User Manual

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You can connect one or more telephones to your QGFSP. When 
using several telephones, an individual telephone should be 0.5 
to 1.5 REN (ringer equivalency number). 
The REN of the telephone is usually on the bottom of the 
telephone. Add the REN of all the telephones you intend to use. 
The total REN of all telephones that you connect to your 
telephone wiring must not exceed 5.0 REN.
(You can discuss this requirement with your service provider.)
Activate the QGFSP
When the building was wired to permit telephone service via 
the QGFSP, jacks for the telephone were installed, or existing 
jacks may have been connected to the Globalstar QGFSP 
components. These jacks are connected by telephone wire to 
the junction box. If your installer did not plug the telephones 
into the jack, do so now. 
Note
All of the phones at your installation will have the 
same number. You can place or receive only one call 
at a time.