We have implemented a simple small office with about 15 users using a ESW-520-48 switch and WRVS4400N router. Type II T1 connected to the router WAN and port 1 connected to uplink on Switch.
There are 13 VoIP devices connected directly to the switch and about 10 WiFi users through the N-router.
We are experiencing some call quality issues even after setting QoS on the router (rate - to prioritize the VoIP). Typical desktop usage is fine.
It is possible that the configuration of the router and switch are not correct (looking for suggestions).
I have limited experience with Cisco products on this scale.
Thank you in advance for any input.