ubuntu-phone team mailing list archive

[Craig Harper <dexteruk75@xxxxxxxxx>]

Hi Marco

I total agree with you regarding the codecs, g729 is a great codec but
there is now an open source versions that seems to work fine

https://www.linphone.org/technical-corner/bcg729/overview

Regarding power consumption but i think this is more about GSM data than
wifi, 3G and 4G have much higher frequencies and these signals have a
harder time to penetrate building so our phones have to output more power.

If we made Ubuntu Touch Data Centric rather than GSM centric.  Switch to 2G
when not using the phone, this will allow more than sufficient bandwidth
for notification, switch to 3G when using applications.  Regarding VoIP if
we design the OS so that we can send a NOTIFY packet to the phone upon a
inbound call, which can be queued, which give the device time to switch to
3G before delivering the call.  I know these things have never been done,
does not mean they should not be.

Have the an OS API where the VoIP can suspend other data usage while the
call is being processed.  Unless the applications is manually activated.

I know you have no control over the data once it leaves your device
especially if your using a public wifi, but here we can try to be a little
smarter, when we are using wifi, lets do background checks to see if there
is packet loss or latency, if there is lets set the VoIP client to reply
480 Temporarily Unavailable and then the carrier can deliver the call to
the GSM as backup.  Im sure you get the idea..

At the end of the day its about making the experience of VoIP more
pleasurable, doing everything in our power to make sure the quality of the
call is paramount.

The world is moving to data, more and more people are looking for bigger
data packages, data only networks appearing all over the world with 4G,
Business are switching to VOIP because of its many benefits.

If we build the functionality into Ubuntu Touch, then VoIP companies can
start to change there network to take full advantage of an OS that is data
centric.

But we have to get the OS right first.

Craig





On Wed, Jul 22, 2015 at 12:08 PM, Marco A. Harrendorf <marcokarlo@xxxxxx>
wrote:

>
> --
> Marco A. Harrendorf
>
>
>
> Am Montag, den 20.07.2015, 14:15 +0300 schrieb Craig Harper:
> > Hi Everyone
> >
> > I would like to start a discussion on VoIP and Ubuntu Touch Phones.
> >
>
> Let me put in my two cents:
>
> * A native implementation of g722 and g729 would be great. If possible
> in a way of a lib which can be implemented by other programs.
> Furthermore, a reference implementation of this lib in a small VOIP
> client would be nice.
>
> * G722 is excellent and the de facto standard for VOIP telephony.
> However, it is absolutely not usable if you are driving in your car and
> are trying to phone over the UMTS connection.
> In this scenario G729 is absolutely the best solution in regards to
> quality and needed bandwidth.
> The most VOIP provider which I used up to now only offer the both
> codecs, so I would not put to many attention on other codecs.
>
> * To my knowledge the G729 codec has quite high licensing costs of
> roughly 6 Euros. For this reason, many Android VOIP clients offer to buy
> this codec as an extra package.
> In my opinion the best solution would be a similar way: G722 is shipped
> by default and it is possible to use further codecs by the above
> mentioned library if they bought and downloaded separately to a common
> codec folder.
>
> * In the long-term it would be nice if the library offers the possiblity
> that the VOIP client based on the lib could be hooked into the dialer
> and so on. Meaning that the VOIP number appears also in the dialer like
> a third sim card, so that there is no visual different behaviour if I am
> using the VOIP connection or the gsm connection.
>
> * A big challenge in this regard could be the energy management in
> regards to allow incoming VOIP calls since this requires a constant
> background connection to the VOIP server.
>
> > I have been in the VOIP industry for many many years, and there is always
> > common problems with VoIP most of which can be other come one way or
> > another.  But when it comes to mobile devices we have a few more thing to
> > take into consideration and this can only be done from the Operating
> System
> > rather than a applications.
> >
> > So I would like to contribute some ideas and start a discussion about
> VoIPs
> > future on the Ubuntu Touch platform.
> >
> >
> > Quality
> >
> > Today we have more and more bandwidth available so its not an issue its
> > really a question of priority.  Just like when you make or receive a
> call,
> > your GMS has priority over your speaker.  When you make or receive a VoIP
> > call your call should have priority over your data, simple things can be
> > done to allow this to happen through API to suspend other applications
> data
> > for example downloads, there is no point in downloading updates when your
> > on the phone call, or downloading emails.  This could be the greatest
> > benefit.
> >
> > Native VOIP over VOIP Application
> >
> > I will say here, Native VOIP is always the way to go, it can have more
> > integration with Operating System, it could be accessed by many
> > applications and the benefits of things being open source the collective
> > efforts can be focused on making the perfect VoIP experience, rather than
> > lots of apps not quite making the mark, because they don't have the
> > integration with the OS needed to provide quality.
> >
> > Echo Cancellation
> >
> > This is a must have to be build into any VoIP Client, Android also have a
> > Native VoIP Client (Great Idea) but still today no Echo Cancellation even
> > after so many years.  (I wonder if GSM companies have any influence over
> > this)
> >
> > NAT (Network Address Translation)
> >
> > One of the biggest problems we have today and foreseeable future is
> Network
> > Address Translation this has come along way over the years and VOIP
> > networks have become better at handling the issues, but making sure the
> > VOIP Client has STUN/ICE support will allow calls work in most network
> > topologies.
> >
> > Codec Support
> >
> > This part i know this is a more of a complicated issue, as there is a
> world
> > of difference licenses, there are now open source version, codecs are so
> > important to help reduce quality issues, the smaller your packets the
> > easier they are going to reach there destination uninterrupted.  Two of
> the
> > most commonly used these days are g729 and g722, with g729 using a little
> > as 9K and g722 using 14K but give providing wider bandwidth sound give us
> > HD quality.
> >
> >
> > Thanks for your time
> > --
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