Cisco Call Manager

Tested with the Orbtalk SIP Trunk service.

Cisco Unified Communications Manager (formerly Cisco Unified CallManager) is the powerful call-processing component of the Cisco Unified Communications solution. It provides voice, video, mobility, and presence services for businesses with up to 30,000 users, Unified Communications Manager is a scalable, distributable, and highly available enterprise-class IP telephony call-processing system.

Cisco Unified Communications Manager creates a unified workspace that extends enterprise telephony features and capabilities to packet telephony network devices such as IP phones, media processing devices, voice over IP (VoIP) gateways, mobile devices, and multimedia applications.

• Highly scalable, supporting up to 30,000 lines per server cluster
  
• Able to support a full range of communications features and applications, including SIP-based applications
• Highly available for business continuity, supporting multiple levels of server redundancy and survivability
• Support for a broad range of phones to suit varying user requirements
• Choice of operating system environments: Windows server-based implementation or Linux-based appliance model implementation