Bob
Some additional info would be helpful...
1. Who is the ISP and are they providing voip in a package deal and their stated provided Bandwidth U/D?
2. Single or Muli line voip?
3. Internet Speedtest results?
4. What type of switches are in use, can you set port speed, flow control, QOS per port or just a plain switch.
5. Is the voip incorporated into the modem/router and the Model #.
6. If voip is a separate unit, the Model #.
Since this is not a SME issue per say, you may contact via PM and I will provide our support # or support chat link.
Although upgrading the local network to giga bit will improve local and wan performance it will not address the
voip problem directly and thus
may not provide the desired voip solution.
There is a firewall, but I do not have control over it. It is controlled by the VOIP company.
That may be true, however we have never experienced that with any of our customers.
I'm sure the provider would configure their equipment if you direct them to your specific needs appropriately.
In our experience, most providers will give you the information needed, to do the allowed configurations yourself.
Typically if their equipment is located on site they will provide information to allow user access to allowed user configuration.
However in this case you probably won't need to have that ability and it's nice to know for the next customer where you may need to know.
The requested information above is necessary to provide a solution to the voip issues.
Without the information and the understanding, one can only provide shoot in the dark solutions.
That may not be the desired approach you want to project to a customer.
Have a good day...