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(Technical note : S1 and S2 are for reverse polarity messaging systems. With
such a system in use, if the telephone does not respond in the S1 position,
switch it to the S2 position and it should then respond.
Some PABX’s require a certain level of software and/or hardware within the
switch. If your telephone appears not to work, make sure that you have the
correct software/hardware installed.
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