TPT provide multi-SIM FCT's. The TPT 2000 box can be supplied with between two and eight SIMS. The unit is modular so the number of SIMS can be upped from two to eight. One needs to remember that the unit needs the same number of spare analogue ports on the PBX as there are SIMS in the unit itself.
Contact Hugh Symons Telecom
Telephone: 0870 849 0226
http://www.hughsymonstelecom.co.uk/