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Telephony and Voice over IP

Asterisk: The Definitive Guide, 4th Edition: <br>by Jim Van Meggelen, Russell Bryant

Asterisk: The Definitive Guide, 4th Edition:
by Jim Van Meggelen, Russell Bryant

List price: $54.99

Softpro Price: $43.99

Building Telephony Systems with OpenSER: <br>by Flavio E. Goncalves

Building Telephony Systems with OpenSER:
by Flavio E. Goncalves

List price: $44.99

Softpro Price: $44.99

Carrier Grade Voice Over IP: <br>by Daniel Collins

Carrier Grade Voice Over IP:
by Daniel Collins

List price: $65.00

Softpro Price: $58.50

Packet Guide to Voice Over IP: A system administrator's guide to VoIP technologies<br>by Bruce Hartpence

Packet Guide to Voice Over IP: A system administrator's guide to VoIP technologies
by Bruce Hartpence

List price: $16.99

Softpro Price: $16.99

Voice over IP Security: <br>by Patrick Park

Voice over IP Security:
by Patrick Park

List price: $60.00

Softpro Price: $54.00