The comfort noise topic was not an issue, until someone got a Samsung S20 in one of our VoLTE deployments.... ;-) There are different types of comfort noise in AMR/AMR-WB and only newer phones use the full scale of comfort noise there is.
Thanks, Carsten -- Carsten Bock I CTO & Founder ng-voice GmbH Trostbrücke 1 I 20457 Hamburg I Germany T +49 40 524 75 93-40 | M +49 179 2021244 I www.ng-voice.com Registry Office at Local Court Hamburg, HRB 120189 Managing Directors: Dr. David Bachmann, Carsten Bock Am Di., 18. Aug. 2020 um 11:48 Uhr schrieb Michael Maier < m1278...@mailbox.org>: > On 18.08.20 at 10:49 Carsten Bock wrote: > > Hi, > > > > one of the big issues with AMR/AMR-WB and Asterisk is that usually > devices > > speaking AMR/AMR-WB do use quite a lot of comfort noise, which is not > > supported by Asterisk as far as I know. Even if you use the patch from > the > > above link, you might end up with some distorted noise. > > Well, during my tests I in fact noticed some more or less silent > distortions which may be caused by comfort noise generated by the mobile(?) > (it's only from mobile -> local phone - > not vice versa). For me it sounds like a pretty silent steam engine. > > I tested with amr and amr-wb in conjunction with transcoding (as I'm > having no local phone supporting amr. Transcoding was between g722 or > g711). Therefore I can't say for sure if > this distortion is a result of transcoding or not. I could here it with > two different mobiles (iPhone and Huawei). After muting of the iPhone, the > distortion mostly went away (no > change with the Huawei mobile). > > > Thanks > Michael > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > asterisk-dev mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-dev
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