Founder of Plivo here.<p>Zentrunk is our SIP Trunking service that provides you global coverage for making and receiving outbound and inbound voice calls using your current cloud or on-premise communications infrastructure (FreeSWITCH, Asterisk, Cisco Call manager, Microsoft Lync, Skype for Business etc.).<p>Whether you’re looking to add a high capacity carrier that can support your growth, or increase coverage and phone number inventory, Zentrunk can get you started instantly. No minimum spends, carrier negotiations or long-term contracts to maintain, Zentrunk lets you provision SIP Trunks instantly through our user interface or via our API. We are list pricing this very aggressively with further discounts at volume.<p>E.g (Prices in US start at)<p>$0.0062/min for outbound calls to local number
$0.0030/min for inbound calls on a local
$0.45 for a US local phone number
Wow, awesome. Of all the telco to Internet interface companies I've encountered, Plivo is probably the best.<p>(SIP trunk quality makes a huge difference. I've been stuck using a Packet8/8x8 number for a while and it is horrible.)
There are much better/cheaper alternatives, like Bitrix24 - <a href="https://www.bitrix24.com/alternatives/free-plivo-alternative.php" rel="nofollow">https://www.bitrix24.com/alternatives/free-plivo-alternative...</a><p>Twilio is still the king, though it gets pricey fast.