| N/A | Aircall headquartered in Paris provides a VOIP system for business designed to support contact centers, featuring IVR and automated call routing, conference calls, shared call inbox and call notes, unlimited concurrent calls and call queuing, and many integrations with CRM or marketing systems to support a variety of support or sales purposes. | $30 per user/per month |
| N/A | Twilio offers a CPaaS and CCaaS solution, with the combination of its programmable Voice, Video, and Messaging APIs, as well as the Twilio Flex cloud contact center. Additional capabilities include Twilio's Elastic SIP Trunking, as well as API for WhatsApp. | $0 per min per participant |