Dear Ms. Cortelli,
Your idea is wonderful, and maybe some company already created a product
that would suit your needs exactly. It would certainly make sense to
research that in professional music circles.
However, when it comes to using a SIP phone such as Linphone, it is
probably the wrong tool for this particular job.
Issue #1 is with the codec. Despite your impression re Zoom, it is not
possible at all to transfer sound across the Internet without using
_some_ codec. Zoom certainly uses a default one.
If it is possible to select Opus Wide using Zoom, that might work for
you. There are various codecs appropriate for different tasks, but most
of them are unsuitable for music, as many are specifically
meant for speech only. Opus Wide is one of few exceptions.
This brings me to Issue #2: if the student is using a telephone, or
Linphone, or anything that has a phone number assigned, then their
telephone service provider could be only
allowing certain codecs. The codec that ends up being used is negotiated
between your phone and your service provider, as well as between the
student's phone, and their service provider,
and one of the codecs available on both ends is selected. So to make
sure it works, both you and the student would have to have ONLY Opus
Wide allowed in Linphone, and both service
providers would have to allow it on their system. Otherwise there would
be translation, and sound quality would be lost.
Your student would need to have a high speed, low latency internet
connection. If the connection is over a cellular network, then anything
slower than LTE will not work properly,
due to high latency. If you use not only sound, but video as well, then
the demands on the network throughput would be much higher than for
sound only.
Bottom line is that I think using VOIP for music lessons MAY be possible
using Zoom, but if Opus Wide is not available, a SIP system (Linphone +
two service providers) will likely not work
to your satisfaction. It is still worth trying, but for business
reasons, I would not see it as a commercially viable system.
If I had proper resources and a company, I would create custom software
based on something like Network Audio System (NAS) but since I know
nothing about it, I will leave it at that.
Maciej Morycinski
#204-5100 Capitol Dr
Burnaby, BC, Canada, V5B 4S7
+1-778-820-0182 <tel:+17788200182>
morc...@gmail.com <mailto:morc...@gmail.com>
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On 2020-12-16 2:28 p.m., Stéphanie Cortelli (mailing list) wrote:
Hello,
I'm new to Linphone and would like to use it for music lessons, where
audio quality is very important.
[...]
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