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.
-- Brandon Martin
