10.2.3-2 Ringing

If ringing is not installed, the user should be able to switch the sound-powered transmitter to the paging system so that a desired party can be called to the line.

Additional Information:
Sound-powered phones require supplemental power, which is often hand- generated, to energize a ringing function. Often sound-powered phone circuits have no provision for ringing. Need for ringing must be determined for the individual plant depending on the sound-powered phone procedures.