VOIP PI Co., Limited. is a one of the leading asterisk telephony card manufacturer in china, with passion in supplying open souce hardware.
VOIP PI Co., Limited. is a one of the leading asterisk telephony card manufacturer in china, with passion in supplying open souce hardware.
The SIPMarket Trade System allows to make phone calls via the Internet at wholesale prices. The intellectual system for choice of an operator automatically forms a list of the most profitable gateways for the requested destination at every call. Moreover,
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