Below are user manuals and quick reference guides for leading phone systems:
Avaya
Avaya IP Office 4400-6400 User Guide
Avaya IP Office 5420 Quick Reference Guide
Avaya IP Office Intuity Mailbox User Guide
Mitel
Mitel 3300 Voice Mail Quick Reference Guide
Mitel 5320 Quick Reference Guide
Mitel 5550 Quick Reference Guide
Mitel 6510 Unified Messaging Telephone User Guide
Mitel 5340 Quick Reference Guide
Mitel 6510 Unified Messaging Quick Reference Guide
ShoreTel
ShoreTel 110 IP Phone User Guide
ShoreTel 115 IP Phone User Guide
ShoreTel 212K Ip Phone User Guide
ShoreTel 230 IP Phone User Guide
ShoreTel 265 IP Phone User Guide
ShoreTel 560 IP Phone User Guide
ShoreTel 565G IP Phone User Guide