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Revertible RingFunctional description
The function allows extension subscribers to check their numbers or verify whether the calling signal normally works.
Operating procedure
- Revertible ring in the general phone/D-Tel
A extension subscriber hooks off the handset. Dial his or her number. Hear the service set tone. Hook on the handset. 5 Hear the phone ring.
6 Hook off the handset.
7 Hear the check tone.
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