Dispatchable Location Services package makes your PBX meet the Ray Baum's Act.  We have 2 solutions for your DLR Dynamic Location Routing and FLR Fixed Location Routing.  DLR uses a DID pool to assign the telephone number and is available for a period of 1 hour and allow direct call-back during that period.  It is the least cost way of achieving this requirement.  Whereas, FLR requires each endpoint to have its own fixed telephone number association with its building location, floor level and/or room number.  DLS cost $19 per month, DID Number $1 each to $3 per month and onetime setup fee is $6 per number.  If pay in advance save 20% making your service annually instead of monthly.  You will need a telephone number for each device/phone/extension on your PBX system.  We sell Phonesuite Voiceware uses DLR and Grandstream IP PBX uses FLR.