Quality of Service (QoS) is a feature on most business grade firewalls that allows prioritization of VoIP traffic over other types of traffic (i.e. Youtube or email). Depending on the internet connection and the local network, QoS can greatly increase the voice quality on calls, and it needs to be implemented for every customer.
The configuration of QoS rules vary wildly from one firewall brand to the next, but there are some general guidelines:
- Prioritize all traffic with a destination for our server IP addresses. For all new customers, the range is 220.127.116.11 - 18.104.22.168.
- If applicable, set the DSCP tagging to 46(EF).
- When setting up QoS rules, add a rule instructing the firewall to always allow traffic from Cytracom servers.
- If a bandwidth amount needs to be set, it can be calculated at 70kb/s per call. If 10 calls are expected during the busiest times, allocate a minimum of 700kb/s.
Note: These are general rules for setting up QoS. Each firewall will have a different configuration.