I have had a Microcell here in Charlotte, NC market since inception. We maintain 5 phones on our account with the $20 /mo. unlimited plan which I'm ok with since our application is mainly home based business. But we have never been able maintain a call for more than a min. or 2 without it dropping.
We still consider it better than our alternative which s 0 signal in our home offices... At least we can now receive calls and call back on our Vonage home office service which is great as long as bandwidth is not compromised for other usage considerations.
After months of talking back and forth with AT&T support, which although they have been prompt and apt to serve, has been lacking in a solution.
I've tried everything I knew but to no avail., including setting the MCell in a prioritized config. which disabled all our internet access for all other devices... I could not get the MCell to route thru to the router...
At this point I wish AT&T would simply recommend a QOS capable router and I'll purchase that one, but hopefully I wont have to rely on that as just today after dropping a dozen calls, I got angry and made some network changes which surprisingly seem to have helped...
I installed an old Sonicwall TZ 170 and placed the MCell on the Optional Port and then setup a DMZ Zone.
Then I configured the zone to guarantee 512k to 1024k for bandwidth to that zone. (I know excessive, but...)
Finally I turned off WAN MTU Packet Fragmentation completely. While this may affect the rest of the network, so far my internet speeds and reliability seem unaffected. And, I have since been able to maintain 2 calls with zero voice quality degradation and neither call dropped. One was for 3 min. and the other 6.
Cross your fingers this may be an answer! The only downside is that Sonicwall firewalls are not cheap. But this may be a new market open for eBay.
I'll keep you posted on our ongoing results.