Hosted telephony supplier FLR Spectron specialise in business VOIP (voice over IP - voice over internet protocol) and SIP (session initiation protocol) using the new BT Hosted solution. Tel 0845 899 9900
SIPxchange is headquartered in Dallas Fort Worth providing wholesale carrier and business VoIP services. SIPxchange is part of the Worldcall Inc. family of companies supplying network services since 2004. Our facilities-based network carries over 50 milli
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