Speech codecs in VoIP
One of the many advantages of VoIP, and in digital communication technologies in general, is having complete control over the audio quality and fidelity of the transmitted signals. This post summarizes some of the commonly used speech compression techniques in VoIP, provide audio examples, and offers some tips to
Digit Maps
As mentioned in a previous post, there are two ways to dial SIP phone calls: with on-hook dialing and with off-hook dialing. This post will detail the differences and introduce the digit map and digit map timeout. On-hook dialing On-hook dialing is the simpler case so we’ll start with
Getting ready for VoIP
I’ve heard many times from integration partners that they prefer to use analog telephone lines vs. VoIP lines for their conference room installs because it just works. While I totally understand the ‘familiarity factor’ of using analog twisted pair for telephony and knowing it will work like the hundreds of other times you’ve integrated with […]
Selecting DSP audio equipment
These days there are more and more DSP (digital signal processor) audio products available. You know the type of product with analog inputs and outputs on the back panel with some RS-232 and/or network control, a suite of audio processing capabilities, including equalization, mixing, matrixing, and often including acoustic echo cancellation for conferencing applications, and […]