Cisco Ip Telephony (Cisco Certification & Training)
Ip Telephony Unveiled
Cisco Ip Telephony: Planning, Design, Implementation, Operation, and Optimization
IP Telephony Using CallManager Express Lab Portfolio: Lab Portfolio
CCNA Wireless 640-722 Official Cert Guide (Certification Guide)
The Road to IP Telephony: How Cisco Systems Migrated from PBX to IP Telephony
Troubleshooting Cisco IP Telephony (paperback) (Networking Technology)
Integrating Voice and Data Networks (Cisco Press Core Series)