A very useful function for seeking the subscriber, it allows calling to several extensions and external telephone numbers – to any place of the world. This function allows users to be available on several devices, such as cell phone, home phone, office telephone or soft phone. In other words, when someone calls you, this call will reach all your communication means.
O.S.S Corporation began to offer IP telephony and Internet services in the middle of 1999 year. In spring of 2000 it was on the top of independent ratings of the Russian IP telephony operators. Nowadays company owes the most powerful access pool to provid
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