S7200 long distace communication

We have a site that is sittuated apart from the control room of 35Km. The system is only for monitoring 12 I/p so its very small one. They need an HMI that is in the control room (35Km from the PLC) and they need to send SMS to mobile when any alarm message.

We have suggested to have S7 224 with CP 243-1IT to go trough the internet and GSM kit TC 35i T for SMS messages.

The HMI is located in the control room looged to the internet and WINCC installed on it

Is this a right configuration?

Take a look at "micro automation set 21" from Siemens.
It is a Wireless Data Communication based on GPRS.
They use the CPU 224 XP + Sinaut Micro SC (OPC server) + WinCC Flexible + GPRS modem MD720-3

Here is the link for the above:

www.siemens.com/microset