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Zadarma
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Bria Mobile: VoIP SIP 通信网络电话
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Apollo Telecoms Limited
Aircall
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FCCHD
FreeConferenceCall.com
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Securax EOOD
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mytello: International Calling
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iCallMore
A3M COMMUNICATIONS LIMITED
Donvoip
Liyana Telecom
yaxim - XMPP/Jabber client
Georg Lukas
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Rynga - Cheap Android Calls
Solaris Systems BV
Bria Enterprise
CounterPath Corp
Onoff Business
Onoff Telecom
iTalkBB Prime – 中美双号 移动支付
iTalk Global Communications, Inc.
Drimsim — mobile data abroad
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VoipDiscount
Finarea
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Voys
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