Issues with Hosted 3CX

We recently moved to a hosted 3cx phone system.   Ever since we moved to the new system we have had problems with the phones.   Dropped calls, incoming calls not ringing, no audio on one end, no dial tone, etc.  

The provider has worked to resolve the issue.   First they discovered that we were maxing out our bandwidth so we increased it.   After we still had issues they decided it was our routers/switches and they replaced and configured all switches, routers and firewalls with their preferred vendor.   We still had problems so they blamed it on the DHCP server and assigned static IPs to all the phones.  When that didn't resolve the issues they blamed the DNS server and changed the DNS server from the internal DNS server to Google which did not help either.    

Has anyone else had similar issues?   Are there any suggestions?
qvfpsAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

PhonebuffCommented:
Putting your Phone system in the cloud is some what smoke, magic and mirrors.  

For one thing, what does the call load look like, if most of your calls are internal (ext to ext) then this can add a load to the connectivity that you were not expecting.  Second you should look at a VoIP bandwidth calculator there is a good one on Voip info.  

Lastly, the Voip load is only a pat of what's on your network and as business demands change so might the performance of VoIP.   I would start by looking at VLANS,  getting a VPN between you and the vendor and moving as much as possible to TCP from UDP. Be sure you have proper QOS on your LAN so that server access and application traffic is not crowding out your voice traffic.

Good Luck --

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
IP Telephony

From novice to tech pro — start learning today.