^rH648 Enable Emergency Sidetones^r

With this option, audible sidetones are generated with the emergency
sequence. 

This option requires one of the following options:

         H961 Emergency Scheme A
         H962 Emergency Scheme B
         H963 Emergency Scheme C
         H967 Emergency Scheme D

Applicable Models: MX1000, MX2000, MX3000

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