Meridian 1 Option 11C is a digital private branch exchange (PBX) for enterprises, delivering advanced applications and carrier-grade, five-nines reliability for traditional voice and Voice over IP (VoIP) communications. Expandable to 800 lines, the Meridian 1 Option 11C supports desktop and system features of larger Meridian 1 systems, including digital and IP telephones, IP Gateways, mobility (802.11) communications, voice messaging, call center, PC-based system management, and multimedia applications.