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Tips for Installing PBXMate in a Distributed VoIP Network

  • Posted by admin
  • On February 3, 2013
Background Many VoIP network administrator face a common problem that their users complain about the quality of their phone calls. The most common complains are about noise, echo and other artifacts. If the network is distributed, it becomes very difficult to analyze and control the multiple components in the network starting from the end devices […]
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Intercoms and Acoustic Echo Cancellation

  • Posted by admin
  • On November 12, 2012
Background One of the disturbing problems that appears when using intercoms, or other low-end full-duplex communication devices, is the generated echo.  Usually the echo is significant in these situations due to the following two reasons:
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Echo Cancellation with Flash – A Case Study

  • Posted by admin
  • On September 7, 2012
Background From time to time we are getting requests to improve audio quality in flash calls and mainly to help remove echo. In a previous post, Echo Cancellation with Flash Clients, we discussed few techniques that could be helpful. In this post we show a case study for integrating a centralized audio filtering to improve […]
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Echo Cancellation with Flash Clients

  • Posted by admin
  • On December 6, 2011
Background In the beginning of this year, Adobe has released an acoustic echo cancellation as an integral part of its platform. Based on the feedback we are getting, the problem of echo was successfully reduced but not in all environments and especially not in environments that include mobile platforms.  SoliCall’s network echo cancellation technology could […]
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Improving Audio Quality with Analog Telephone Adapter (ATA)

  • Posted by admin
  • On November 14, 2011
Background One of the first steps SMBs take towards VoIP is to add ATA to their existing analog telephone network. There are many well known brands of ATAs in the market today like Linksys PAP2, Cisco PAP2T, Grandstream HandyTone and others. Regularly we are requested to improve audio quality in such telephony systems – especially […]
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Acoustic Echo Cancellation and Sound Cards

  • Posted by admin
  • On September 1, 2011
Clock Synchronization Acoustic Echo Cancellation (AEC) is a method of removing the echo from the audio signal captured by the microphone. This is done by using the audio that is played to the speakers as a reference audio signal. Most AEC algorithms require that both audio signals, i.e. the signal captured from the microphone and […]
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Audio Quality When Using Speakerphone During Phone Calls

  • Posted by admin
  • On July 5, 2011
  Background There are different scenarios in which calls are made using speakerphones. For example: In manufacturing floor where the employees want to have an open communication channel without the limitation of headset or handset. When using intercom devices. When more than one person needs to listen to the call (e.g. in conference rooms). When […]
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Echo in VoIP and Altruism

  • Posted by admin
  • On January 30, 2011
What is echo in telephony? In a nutshell, echo is the phenomena in which your voice is being played back to your speakers. Echo has been with us since the early days of telephony. In the past, when most people where using PSTN lines, echo was less disturbing due to the fact that the delay […]
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Echo cancellation for browser-based Flash/Silverlight chat applications

  • Posted by admin
  • On January 17, 2011
Browser-based chat applications Several of the vendors that develop audio/video chat applications decide to do it using Flash or Silverlight technology due to the following two advantages: 1.       The end-users do not need to install any additional software, except for the necessary plug-ins on their existing browser. 2.       The end-users can run the application on […]
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