Install VX2200 GSM Module on Videx Intercom

I need a skilled technician to install a VX2200 GSM module on my Videx intercom system. The primary functionality I want to enable is call forwarding to another UK landline number, with immediate forwarding... (Budget: £250 - £750 GBP, Jobs: Security Systems, Telecom Sales, Telecommunications Engineering, Telecoms Engineering, VoIP)