“We previously used Asterisk PBX for VoIP communications,” says Pavel Kamenický, Software Analyst at MEDAX Systems, Czech Republic, “but we had outgrown it.” Created in 1999, Asterisk is an open-source PBX software that spearheaded the development of more affordable phone systems. However, as a cloud-based phone service with limited customization options and reliance on community volunteers for support, it didn’t meet the demands of MEDAX Systems’ fast-expanding client base.