Extend the Life of Your Equipment with Telecom Customer Service
Cornerstone Communications extends the life of a customer’s telephony equipment by maintaining post-warranty systems indefinitely. This allows you to upgrade or migrate your systems when it makes business sense–not when the manufacturer dictates.
For more information call 888-963-9884
or fill out the form below and an CSC Specialist will be in touch.
A Higher Level of Service, at Substantial Savings, for Over 25 Years

Cornerstone Communications Post Warranty Program is a customized, flexible program designed to meet the special telecom maintenance needs of any company, from small businesses to large corporations. This personalized program is supported by our experienced team of highly trained telecom customer service representatives, an in-house corps of Tier III technicians, and a global network of over 800 qualified field professionals. Together they provide the most comprehensive, valuable, user-friendly telecom maintenance program in the industry.
Cornerstone Supports Avaya Systems, Cisco Systems, and Many More
AVAYA
Supported Avaya Systems
- Merlin
- Merlin Legend
- Merlin Magix
- Merlin Messaging
- Partner
- Partner Plus
- Parnter ACS
- Partner Mail
- Partner Mail VS
- Definity G3i
- Definity Audix
- Intuity Audix
- Communications Manager
- Modular Messaging
- Aura Messaging
- CM1
- CM2
- CM3
- CM4
- CM5
- CM6
- CM6
Cisco:
- Call Manager
- Unity Voice Mail
Nortel
Fujitsu
Siemens
Polycom
Spectralink
Ascom
Our Post Warranty Program
Helps You Optimize Your Current System
The benefits of this service go beyond cost. This comprehensive program increases the efficiency and performance of your current system and gives you round-the-clock monitoring and support. Plus, you get the flexibility to upgrade or explore other options on your schedule. In an uncertain market, choices like this are more important than ever.
At Cornerstone, we offer your preferred billing options and the best service in the industry. On average, this program saves customers 20-30% off their current maintenance costs. Along with substantial savings, you can take advantage of many more benefits, including: