On 12/30/19 3:34 PM, Christopher Morrow wrote:
On Mon, Dec 30, 2019 at 6:09 PM Michael Thomas <m...@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
