This object specifies whether the Delay Measurement (DMM) single
ended Responder is enabled.
The value 'true' indicates the single-ended Delay Measurement Responder
is enabled and if a DMM message is received a DMR will be sent in reply.
The value 'false' indicates the single-ended Delay Measurement Responder
is disabled. If a DMM message is received no response will be sent and
the message will be discarded.
This object needs to be persistent upon reboot or restart of a device.
A MEP can be both a single-ended Responder and Controller simultaneously.