<div dir="ltr">The usage of AMR codecs is mostly in the LTE space - which means that you're probably aiming to run a slightly higher scale than a single Asterisk server.<div>Why not simply install Kamailio+rtpengine as your signalling media front-end and then relay everything back to Asterisk using a low-footprint codec, like alaw?</div><div><br></div><div>To me, that would sound like the proper solution in this case. Indeed, there is a minor technical up-hill - but it's worth the effort. Asterisk is a great codec linguistic,<br>but when it comes to "pure transcoding" - Kamailio+rtpengine are far more capable.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Aug 18, 2020 at 2:31 PM Carsten Bock <<a href="mailto:carsten@ng-voice.com">carsten@ng-voice.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">The comfort noise topic was not an issue, until someone got a Samsung S20 in one of our VoLTE deployments.... ;-)<div>There are different types of comfort noise in AMR/AMR-WB and only newer phones use the full scale of comfort noise there is.<br><div><br></div><div>Thanks,</div><div>Carsten<br clear="all"><div><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr">--</div><div dir="ltr">Carsten Bock I CTO & Founder</div><div dir="ltr"><br><p style="margin:0cm 0cm 0.0001pt;background-image:initial;background-position:initial;background-repeat:initial"><span lang="EN-US" style="color:black">ng-voice GmbH</span><span lang="EN-US" style="color:rgb(0,112,192)"><u></u><u></u></span></p><p style="margin-right:0cm;margin-bottom:12pt;margin-left:0cm;background-image:initial;background-position:initial;background-repeat:initial"><span lang="EN-US" style="color:black">Trostbrücke 1 I 20457 Hamburg I Germany<br>T +49 40 524 75 93-40 | M +49 179 2021244 I <a href="http://www.ng-voice.com/" style="color:rgb(17,85,204)" target="_blank"><span style="color:black">www.ng-voice.com</span></a><u></u><u></u></span></p><p style="margin:0cm 0cm 0.0001pt;background-image:initial;background-position:initial;background-repeat:initial"><span lang="EN-US" style="color:black">Registry Office at Local Court Hamburg, HRB 120189<br>Managing Directors: Dr. David Bachmann, Carsten Bock</span></p></div></div></div></div></div></div></div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Am Di., 18. Aug. 2020 um 11:48 Uhr schrieb Michael Maier <<a href="mailto:m1278468@mailbox.org" target="_blank">m1278468@mailbox.org</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 18.08.20 at 10:49 Carsten Bock wrote:<br>
> Hi,<br>
> <br>
> one of the big issues with AMR/AMR-WB and Asterisk is that usually devices<br>
> speaking AMR/AMR-WB do use quite a lot of comfort noise, which is not<br>
> supported by Asterisk as far as I know. Even if you use the patch from the<br>
> above link, you might end up with some distorted noise.<br>
<br>
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 -<br>
not vice versa). For me it sounds like a pretty silent steam engine.<br>
<br>
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<br>
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<br>
change with the Huawei mobile).<br>
<br>
<br>
Thanks<br>
Michael<br>
<br>
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