ACU-5000 Operations Manual
Interoperability Now
7
Glossary
SIP
Session Initiation Protocol – A flexible, standards-based, open protocol that initiates and manages
communications between devices over an IP network.
Soft Phone
A computer that’s used as a VoIP phone.
Squelch
A means of detecting audio and causing some action when it is present, such as keying a transmitter
or unmuting an audio path.
TX
Transmit or Transmitter.
VMR
Voice Modulation Recognition. An algorithm which causes a transmitter to key or causes some
other action when voice is present. This squelch type is activated by only by human voice, and not
by tones, noise or other non-speech audio. Particularly useful for noisy signals such as HF.
VoIP
Voice Over Internet Protocol - Protocol for delivering voice communications over IP networks.
Most network-phone providers (such as Vonage), use VoIP.
VOX
Voice Operated Xmit (Transmit). A circuit or algorithm which causes a transmitter to key or causes
some other action when sound is present. This squelch type is activated by any audio signal, and
is not restricted to voice only.
Summary of Contents for ACU-5000
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