On 12/30/19 1:35 PM, Brandon Martin wrote:
On 12/30/19 4:14 PM, Michael Thomas wrote:
The latency argument is what interests me. Supposedly 4G's latency
and jitter are tough on voip. If that improves there is just no
reason for TDM to phones which is a significant development because
cell phones are probably the largest deployment of old style PSTN
stuff these days as landlines wither and die. I would think that
carriers would embrace that since it would be a cost-down, but I'm
sure I'm wrong since that would be admit defeat to IP.
VoLTE is already essentially VoIP, including packet switched media,
with some MAC layer QoS guarantees as I understand it. Now, maybe
those MAC layer guarantees essentially amount to a dedicated OFDMA
sub-carrier during a voice call. That I cannot speak to as I'm not
intimately familiar with the LTE/LTE-A air interface.
I can say that plain ol' best-effort LTE data services are generally
sufficient for VoIP in my experience if you have "good coverage".
That means what I'd generally consider "toll-grade" quality in terms
of latency and, more inmportantly, jitter. SSH is similarly quite
usable generally. If you're on the fringe of a cell or have a cell
that's overloaded, YMMV.
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?
Mostly what I want in the future is a dollop of EF QoS bits and let me
determine how to use them...
Mike