I would, also, like first puzzled statics, at least in one of the offices. How much do Beeline is now white IP? 500 rubles a month?
Plus, even if there is attachment to analog telephone lines (such as all customers know and are accustomed to), there is a persistent opinion that it is time to migrate to SIP, which will allow to fully use the flexibility and scalability of Asterisk in the future. Take the fact that you can deploy asterisk in any other geographical place and virtualnoy the car, not to mention moving office. Instead of buying the Board www.pbxware.ru/catalog/platy_digium/analogovye_platy
buy SIP phones or SIP gateways.