Microcell recently stopped working; Network light won't stop flashing green
I've had a Cisco DPH-154 for nearly a year now. It worked perfectly in my office until Wednesday evening, September 9. Now, and despite hours on the phone with AT&T and many hours of investigation by network experts in my office, we cannot get this thing to work again. I've reset and power cycled the thing many times. The power, Internet and GPS indicators always end up Green, but the Network indicator just flashes Green - and folk are unable to connect to the MicroCell to make or receive calls. The MyAT&T website even says that Activiation is complete:
About a month ago, my company implemented Zscaler, but the MicroCell seemed to work just fine until 11 days ago (well after the Zscaler implementation). My company gets WAN from OBS over NBIG.
I've taken it home and connected it to my personal home network, and all is well - but it's my office where the signal is so poor. Despite what the MyAT&T MicroCell setup page shows above, AT&T says that the unit is “Unable to establish a connection on port 4500 due to no response.” We believe this is something related to the unit NOT responding to ICMP echos. But when we blocked those on our home routers, the unit still came up just fine and we were able to connect to the MCell signal - so we believe this was a red herring.
So, of course, I'm thinking that it's something that has changed in my company network. And as I've said, some very smart network experts in my office have spent hours poking at this thing, but to no avail. All of the ports indicated in the AT&T documentation are open. There are, of course, more than one switch/router between the MicroCell and the WAN. I've read Otto's guide, and ran some of the tests suggested (output below) but nothing seems to help.
Any ideas where to look next?
8x8 VoIP Test:
Speed test statistics
Download speed: 10301 kbps
Upload speed: 718 kbps
Download consistency of service: 61 %
Upload consistency of service: 13 %
Download test type: socket
Upload test type: socket
Maximum TCP delay: 145 ms
Average download pause: 2 ms
Minimum round trip time to server: 90 ms
Average round trip time to server: 97 ms
Estimated download bandwidth: 58299 kbps
Route concurrency: 5.6593556
Download TCP forced idle: 91 %
Maximum route speed: --
VoIP test statistics
Jitter: you --> server: 7.1 ms
Jitter: server --> you: 2.0 ms
Packet loss: you --> server: 1.8 %
Packet loss: server --> you: 0.0 %
Packet discards: 1.6 %
Packets out of order: 0.0 %
Estimated MOS score: 2.6
IP address: 220.127.116.11
Local time: Sep 21, 2015 1:19:59 PM
Test server: http://voiptest.8x8.com:82/
Of course, if AT&T and the FCC can get on the same page with respect to cellular calls over WiFi, I might just be able to forget the MicroCell. Then again, it's the FCC.....