This solution will allow combining and uniting communication within one office, between offices, city, long-distance, mobile and international communication on the basis of GSM-and VoIP-equipment of TELES Company (Germany).
Example 1 (TELES.iGATE):
The company consists of three offices (A, B, C). There is a necessity to make city and long-distance calls (PSTN – public switched telephone network), mobile calls (GSM 900/1800), and calls abroad (for example, to Russia, the USA, Germany).

Offices can be situated in different buildings, different cities and even in different countries (offices should be connected to Internet). VoIP communication between offices is free.
City calls are rated according to the prices of city calls, and long distance calls – according to the minimal rates (using “unlimited” cards of mobile operators).
Calls on mobile phones are according to optimum rates (using “unlimited” cards and intranetworking calls).
Calls abroad are carried out according to the rates of Vincomm network in any country of the World (on mobile and fixed phones).
Example 2 (TELES.VoIPBOX GSM4 FX):

This variant is simpler and cheaper than the first one.
Costs on long-distance and international office calls are optimized. It is also possible to organize calls from mobile phones abroad according to the Vincomm rates.
See additional information on www.teles.com.ua