Re: 5G roadblock: labor

[Michael Thomas <mike () mtcc com>]

On 12/30/19 3:34 PM, Christopher Morrow wrote:
> On Mon, Dec 30, 2019 at 6:09 PM Michael Thomas <mike () mtcc com> wrote:
> > On 12/30/19 2:46 PM, Brandon Martin wrote:
> > > On 12/30/19 5:42 PM, Michael Thomas wrote:
> > > > Oh, I didn't know that. Seems like it's a relatively new thing. Seems
> > > > like they went to a lot of trouble to essentially do what voip does.
> > > > Or maybe not? I've been poking around trying figure out what's going
> > > > on under the hood with wifi calling, and it seems like they're just
> > > > tunneling PSTN bits over the internet. If true, that's certainly a
> > > > quick and dirty hack. Maybe they're doing something similar for volte?
> > > My understanding is that VoLTE is signaled using SIP.  I don't know
> > > how the media moves.  I think they tried to avoid re-inventing the
> > > wheel. Most of the "phone" guys are slinging a lot of inter-network
> > > calls via IP these days, anyway.
> >
> > Yeah, maybe it really is RTP because iirc, VoLTE can use different
> > codecs. That would make some sense since a lot of those voice bits are
> > going to end up as RTP at some point. I can understand the wifi hack
> > since they may not have had the ability to directly deal with customer
> > facing RTP from the phones 5 years ago.
> >
> > Maybe my google-foo is really bad, but it's not been easy to get an
> > overview of what's going on under the hood for these. And I'd prefer to
> > avoid the 3GPP tar pit.
> I had thought the 'benefit' of LTE (specific to Voice) was a SIP UA
> was implemented at the handset for all 'voice' over the LTE network.
> (voice calls through your carrier - VoLTE)
>    https://en.wikipedia.org/wiki/Voice_over_LTE
I finally found something and it is indeed SIP/RTP over a LTE with some 
extra qos secret sauce. I have no idea what's going on differently in 
the MAC.

So we're definitely almost there. And that's a good thing.

Mike