PBX Vendors - Links 

Avaya Telecommunication Systems

Business communications technology from Avaya, a leading telecommunications company, gets communication-driven results.

Asterisk

Asterisk | The Open Source PBX

Nortel

Nortel is a recognized leader in delivering communications capabilities that enhance the human experience, ignite and power global commerce, and secure and protect the world's most critical information.

Siemens AG

HiPath from Siemens - innovative solutions, services, applications, and hardware for a resilient, secure, and economical communications environment in companies of all sizes.

Ericsson's communication solutions

Ericsson's enterprise communication solutions, for small to medium-sized enterprises,large enterprises & organisations and for SOHOs.

Mitel Networks

Mitel Networks: IP telephone systems and solutions

Philips Business Communications

Philips Business Communications (PBC) is a leading provider of enterprise-wide communication solutions that enable medium to large-sized organisations to exploit the power of integrated voice communications.

Panasonic Communications Systems

Panasonic Communications Systems

Useful Background information and technical sites 

Tek-Tips Forums

A Great free technical forum with threads and faqs on every technical topic you can think of.

Telecom Traffic Online

Traffic Online contains online resources to assist the global network professional with telecommunications traffic design and analysis.

Useful PBX books on Amazon 

PBX Systems for IP Telephony

by Allan Sulkin

Amazon Price: $43.16 (as of 09/06/2008)

Voice over IP Fundamentals

by Jonathan Davidson, James Peters, Brian Gracely

Amazon Price: (as of 09/06/2008)

Call Centers For Dummies (For Dummies (Computer/Tech))

by Ral Bergevin

Amazon Price: $16.49 (as of 09/06/2008)

Essential Guide to Telecommunications, The (4th Edition) (Essential Guide Series)

by Annabel Z. Dodd

Amazon Price: $31.49 (as of 09/06/2008)

Telecommunications Essentials: The Complete Global Source for Communications Fundamentals, Data Networking and the Internet, and Next-Generation Networks

by Lillian Goleniewski

Amazon Price: $43.11 (as of 09/06/2008)

Telephone Switching Systems

by Richard A. Thompson

Amazon Price: $185.00 (as of 09/06/2008)

Related Lenses 

• Call Centers
  This Lens is an extensive source of information on Call Centers and all business, human and process related practices.
• Telephony
  This Lens is a starting point for those looking for basic information on Enterprise Telephony
• Contact Centers
  This Lens is an extensive source of information on Contact Centers and all business, human and process related practices.
• Avaya
  Everything about Avaya, world's market leader in VoIP, Call Centers, Mobility and Enterprise Telephony.
• Avaya Training
  The Avaya Learning Portal