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GlobalPhone recommends the below books for VOIP University training.

For up to date Hosted PBX service price quotations and VOIP phone model selection, please contact sales@gphone.com or call 703-584-4360.

 
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SIP Demystified
SIP Demystified
SIP Demystified
SIP: Understanding the Session Initiation Protocol
SIP: Understanding the Session Initiation Protocol
SIP: Understanding the Session Initiation Protocol
Carrier Grade Voice Over IP
Carrier Grade Voice Over IP
Carrier Grade Voice Over IP
Switching to VOIP
Switching to VOIP
Switching to VOIP
Asterisk: The future of telephony
Asterisk: The future of telephony
Asterisk for Dummies
Asterisk for Dummies
Asterisk for Dummies
Configuration Guide for Asterisk PBX
Configuration Guide for Asterisk PBX
Configuration Guide for Asterisk PBX
TrixBox Made Easy
TrixBox Made Easy
TrixBox Made Easy
Introduction to Private Telephone Systems; KTS, PBX, Hosted PBX, IP Centrex, CTI, iPBX and WPBX, 2nd Edition
Introduction to Private Telephone Systems; KTS, PBX, Hosted PBX, IP Centrex, CTI, iPBX and WPBX, 2nd Edition
Introduction to Private Telephone Systems; KTS, PBX, Hosted PBX, IP Centrex, CTI, iPBX and WPBX, 2nd Edition