VoIP communication requires a wholesale provider of services, known as a tier 1 wholesaler. This is a company that buys connections between countries at a rate based upon the anticipated level of traffic. Generally speaking, the higher the volume of calls, the lower the rate.
Choosing a Wholesale SIP Provider
SIP Trunking The modern alternative to the ISDN system is SIP trunking. Like PRI, SIP trunking connects your internal PABX to the PSTN. Although, ...