Nico, you may (and may not) get some improvement in voice quality if you select a network-optimized codec, such as speex, iLBC, SILK, and so on.
Most VoIP providers don't offer these codecs, because of their complexity and required CPU power. So, your best choice would be to install one or several VPS'es around the globe, set up some VoIP server software, like FreeSWITCH or Asterisk, and control the full communication between them and your clients. Then these VPS'es would hand over the traffic to some local PSTN providers. So, this needs some engineering, customization, tests => $$$ :) cheers, stan On Sun, Jan 25, 2015 at 4:14 PM, Nico Schottelius <nico-swino...@schottelius.org> wrote: > Good morning Swinog, > > we are looking for a new VoIP hoster that actually offers decent voice > quality, preferable even over hspa(+) based networks, working in the US, > Switzerland and South Korea. > > Working := can receive / make phone calls well enough for daily use (I > am aware that VoIP should work everywhere, but in practice the quality > either in Switzerland or abroad or both is too poor to talk for long). > > So far we are using telephoenix.com (reseller of $provider), but have > huge problems in terms of voice quality (even via wifi via dsl / cable). > > I was wondering, if anyone can recommend a provider and also has tested > reachability in East Asia and North America? > > Cheers, > > Nico > > -- > New PGP key: 659B 0D91 E86E 7E24 FD15 69D0 C729 21A1 293F 2D24 > > > _______________________________________________ > swinog mailing list > swinog@lists.swinog.ch > http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog -- Stanislav Sinyagin Senior Consultant, CCIE #5478 ssinya...@k-open.com +41 79 407 0224 _______________________________________________ swinog mailing list swinog@lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog
