The gaurd time is the duration between the end of one call and the start of next call. This object specifies what should be such a duration. All state changes from the PBX are ignored for this duration. After receiving DLCX, this timer will be started for a period as configured in this object, and will not honor any off-hook events before the expiration of this timer. This object cannot be configured if the signaling type for the line to which this ds0 belongs is non cas. For a cas line this object CAN only be configured only after associating this ds0 with an endpoint This object will be applicable if ds0CasParameterSource has a value of mibValue (2). The allowed range for this object is 10..1000.