Numbers with expansions represent the short numbers fixed to your account. Having called on specialised number of access from a telephone system of the general using (PSTN), will be to enter after a sound signal the short number enough, and the call will come on SIP the device registered under your account. The given service is absolutely free for users of a network RinGo. In case on your account readdressing is specified in number in PSTN for a call cost under tariffs for proceeding communication will be collected.