The 212 is a Least Cost Routing option for PBX's that are ISDN 2. The unit connects to a spare ISDN 2 port on a ISDN 2 PBX and the PBX would then need to be programmed inorder to divert calls to mobiles via this unit. HST can supply the unit either with or without airtime.
Contact Hugh Symons Telecom
Telephone: 0870 849 0226
http://www.hughsymonstelecom.co.uk/