https://www.k12insight.com/platform/telephony-call-center/
K-12 Call Center & Telephony Software | Onflo (formerly Let’s Talk)
Apr 28, 2026 - Transform district communication with Onflo (formerly Let’s Talk) — K-12 call center software with intelligent routing and automatic ticket creation.
call centertelephony softwarekformerly
https://www.rowetel.com/
Rowetel – open telephony software, hardware, critical thinking
telephony softwarecritical thinkingopenhardware
https://www.appvizer.com/communications/telephony
33 Best Telephony Software for 2026 | Appvizer
Discover the 33 Best Telephony Software in 2026. Compare features, integrations, user experience, customer support, and prices on Appvizer.
telephony softwarebestappvizer
https://www.gnu.org/software/ccrtp/
ccRTP - GNU Telephony - GNU Project - Free Software Foundation
free software foundationgnu telephonyproject