Can anyone point to a good technical doc or whitepaper that describes
how this is supposed to work with IOS9 for instance?
* Is IOS9 or carrier code determining when/if wifi calling is possible?
* How is a wireless carrier who's chief business is to operate a
wireless network and sell access to it able to offload traffic to
random networks and still sell that service to customers without the
explicit cooperation of the operators of those random networks?
* Do these "wifi" minutes get charged to customers? SMS?
* To echo what Christopher said, what about 911 etc, who is
responsible for call quality and completion?
* What about geolocation and emergency, does the wifi enhance it or
obsfucate it in any way?
It's getting pretty murky out there!
On 10/16/2015 3:34 PM, Howard, Christopher wrote:
I'm honestly not surprised to hear that they are going to push wifi
calling and nothing else. They want to drop all cellular service
other than data, long term, in my opinion.
I have AT&T myself, and ran the iOS 9 beta from the beginning, which
got me early access to AT&T wifi calling. Needless to say, it has not
been a pleasant experience. Calls drop all the time.
For our wireless we have not had to do anything. Calls just work
without opening inbound ports (we don't limit much going outbound).
My calls run about 65kbps.
The pain point is something you've already mentioned - roaming. If at
any time you roam from wifi to cell and there is no VoLTE service in
your area, the call dies. We apparently don't have VoLTE in
Chattanooga, TN. If I stay in my office I can usually hold a call,
and roaming from AP to AP is sometimes ok. Sometimes the roam between
APs is enough to drop the call. I've also noticed that if I get more
than 2 cell bars, the phone will want to go off of wifi calling on its
own. Even at home where I only have 1 AP and can be sitting 15 feet
from it, I'll drop calls because my phone decided to roam back to cell
during a live call.
To directly answer your questions:
1. I don't plan on doing anything special. We have enough free
bandwidth to handle a large number of 65kbps calls.
2. Mine have been 65kbps or there about.
3. We run both frequencies, but my phone tends to stay 5ghz. I don't
think we would change anything to support wifi calling.
4. I'm not sure how we will get this across other than to let our
helpdesk know what to tell people when they call in about it. We'll
be looking into this more I'm sure.
5. I'm a little surprised that carriers are being allowed to run calls
over end user networks. 911 is a big deal, and if our wifi is up
enough that the phone can do wifi calling, but there are issues going
on to prevent calls, who gets blamed here? In an emergency, it's too
much to troubleshoot what's going on and figure out that you have to
cut off your wireless to get a call through. As far as I know,
there's nothing we have to do in terms of uptime or anything.
-Christopher
On Oct 16, 2015, at 2:14 PM, Smith, Todd <todd.sm...@camc.org
<mailto:todd.sm...@camc.org>> wrote:
Hello,
Yesterday, a regional VP for AT&T Wireless told my Enterprise
Architect and CIO that AT&T was not interested in pursuing a
distributed antenna system with us and made it clear that they would
not be moving forward with any DAS in the future. In seems, that
Wi-Fi calling is the moving forward strategy for AT&T for poor
cellular signal and presumably other carriers. I wasn’t in the
meeting but I am confident that it has been reported accurately.
Does this sound like anything that anyone else has heard? If so, how
are other institutions handling this? It seems silly that our
organization which is in the planning stages for a Wi-Fi wireless
upgrade anyway would build in the necessary upgrades to accumulate
cell carrier backhaul traffic for no compensation whatsoever.
As usual, my job is to do or die, so I am trying to see what others
might have done and if possible start a line of discussion to reason
out the best way to handle poor cellular coverage in both older
buildings as well as brand new LEEDS certified buildings.
1) Would you create a new SSID for cellular traffic with QoS
enabled and open to the Internet with UDP 500 and 4500 open as well
as more normal ports?
2) I can’t find any solid reference that details exactly how
much bandwidth per call. I have literally read in the last couple of
hours, everything from 2.5Kbps to 1Mbps to a general consensus from
60-128Kbps per call.
3) 2.4Ghz or 5Ghz or both?
4) Much of the discussion of seamless handover from cell to
Wi-Fi involved HD Voice which seems to be provisioned as part of
VoLTE and only available in some areas; i.e. not my coverage area.
How to communicate to your normal users and any public that uses
your Wi-Fi that when they switch between platforms; the call will be
dropped?
5) Would we be responsible for maintaining redundant Internet
connections just to support cell calls? Is there any requirement
that would state that since we are providing cellular infrastructure
that we are responsible for a certain minimum SLA?
Is there any other questions or comments to think about?
Todd
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