A major contributing factor to call centers remaining on the PSTN was the rock solid reliability and quality of service, but now that VoIP is becoming more mainstream and reliability has significantly improved, call centers are taking serious strides at making the switch to SIP trunking.
The continual evolution of IP-based telephone networks has spawned, in a word - data. Data is the primary reason for call centers re-evaluation of VoIP and SIP Trunking.
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