VOIP services enable companies to maximize the network infrastructure to provide both Voice and Data reducing the cost of maintaining a dual infrastructure using the traditional PBX technology.  LEEFNET is experience with Cisco Unified Communication Manager, Unified Communication Manager Express, Cisco Unity, Cisco Unity Connection, Cisco Unified Contact Center Express, Cisco Emergency Responder, Cisco IP SoftPhone, Cisco IP Communicator, Cisco Unified IP Phones 7900 Series, Cisco ATA 180 Series Analog Telephone Adaptors, Cisco Unified MeetingPlace Express, Cisco Unified Survivable Remote Site Telephony, Cisco Voice Provisioning Tool, Cisco Voice Gateways (VG224, VG248, AS5800, Cisco 2800 H.323, MGCP and SIP gateway) and Cisco Voice Servers.