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RTP, Jitter and audio quality in VoIP – The Smartvox ...
https://kb.smartvox.co.uk/voip-sip/rtp-jitter-audio-quality-voip/#:~:text=Asterisk%20has%20some%20limited%20capabilities%20for%20users%20to,call%20quality%20in%20the%20context%20of%20RTCP%20reports.
What tools for testing sound quality in Asterisk ...
https://community.asterisk.org/t/what-tools-for-testing-sound-quality-in-asterisk/31799
Although there may be bugs in Asterisk transcoding, sound quality issues are most likely to be due to fundamental characteristics of the codecs, rather than anything to do with asterisk. Most VoIP codecs, and all mobile phone ones, are specifically designed for voice, so a chirp is unlikely to be a valid test.
Recording audio quality - Asterisk Support - Asterisk ...
https://community.asterisk.org/t/recording-audio-quality/78537
8ks/s audio would be expected to roll off steeply at 3.4KHz. Similarly, 16ks/s audio would be expected to roll off from 6.8kHz. If you see energy at anything above 8kHz, the anti-aliasing is broken. The sub-band nature of G.722 may mean you can create sharper anti-aliasing filters, but energy at 11kHz, is still a fault condition.
Recording Audio for Asterisk | Redial
http://www.itp-redial.com/class/weekly-notes/week2-notes/recording-audio-for-asterisk
The audio standard for most Voice over IP is 8000Hz, 16Bit, Mono. Asterisk is going to expect that all audio conforms to this standard. There are a lot of codecs that are used to compress the audio, the most common being ULAW, GSM, and G729. The PSTN will only accept ULAW or G729. G729 is patented, so you have to pay for a license to use it.
Sound quality problems (Choppy) - Asterisk PBX - Spiceworks
https://community.spiceworks.com/topic/165774-sound-quality-problems-choppy
The solution was to move the Asterisk install to a more robust box. Another thing you should consider is upgrading Asterisk. It think we are up to 1.8 now. All my boxes are still 1.6. I know this is a lame typical tech support suggestion but I did have a few issues with 1.4 that got fixed. I think for one customer occasional choppy audio was a ...
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