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H.323 protocol
        NAT and
        security
hacker's PBX
handset (analog phone)
HANGUP command
Hangup( ) application 2nd 3rd
hardware
       Zapata
                configuring for FXO channel
                configuring for FXS channel
       Zaptel
                configuring for FXO channel
                configuring for FXS channel
hardware drivers, Zaptel
        compiling
hardware selection
        choosing a motherboard
        choosing a processor
        performance issues
        power supply requirements
hardware, telephony
harmonic noise on electrical circuits
HasNewVoicemail( ) application
HasVoicemail( ) application
HDLC functionality in Zaptel drivers
head Asterisk
help command
high-fidelity voice
hobby systems
        hardware selection
        system requirement guidelines
home automation
hook switch
HTML error messages, turning off in AGI PHP script
HTML error messages, turning off in PHP
humidity (equipment rooms)
hybrid transformer