I'm taking on a new to me network and have found some voice quality issues. The phones are hosted through Ring Central and we use Panasonic KX-TGP-500 / 550 VoIP phones. We have 11 phone lines and approx. 25 workstations and 10 servers. We use Charter Business 50MB download / 10 MB upload and have a fortigate 40c firewall.
We're having voice quality issues which are random and hard to duplicate, but assuredly happen when on a conference call with a client! We've had two open tickets with RingCentral for months and have combed through the firewall to no avail.
We do use Citrix Receiver to connect to a clients XenApp environment.
I have disabled SIP Helper ( Layer 7 ) on the firewall
I have the requested ports open for UDP
I have created a Voice VLAN on the dell switches and put the three ports of our phone bases in the VLAN -
Here are some questions - Do I enable the Voice VLAN on all ports? If not, do I enable Voice VLAN on the ports that join switch to switch and switch to firewall?
I really want to see quality improve and we are not maxing out our bandwidth up or down so I am stumped.
I am new to VoIP and switch configuration (my background is primarily application support and desktop support) so forgive me in advance if I ask for clarification or a greater detailed answer. I really want to understand the why as much as the how.