Topic: Prompt to the beginner how to make IP a telephony at office on 100 slave to places
There is an office which is divided into 2 buildings, between buildings the optics (10 km) lies, in each building costs automatic telephone exchange approximately on 50 numbers, and plus optics for an Internet approaches on 5 lines from city automatic telephone exchange.
How correctly to organize IP a telephony that at a call from office on a mobile phone, communication went through the operator of MTS, at calls on numbers of Ukraine and abroad communication went through provider IP of a telephony, and at entering calls on city numbers of the enterprise of automatic telephone exchange readdressed a call on internal numbers of employees.
On each workplace it is laid out on 2 twisted steams (one Internet, the second phone).
The budget to 10 000 c.u. (with changeover of analog phones on IP phones)