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?