0. Log in with cisco/cisco
1. Ensure Firmware is Updated
Go to System Summary and check out the firmware version.
You want at least version 1.1.1.06 here. The earlier versions had a bug that makes phones register and de-register from the pbx constantly. If using a cisco RV320 get the LATEST firmware as it has a option to set UDP timeout.
Go to System Management -> Firmware Upgrade
Click "Choose File", browse to the correct file, and hit "Firmware Upgrade"
2. Adjust Firewall Settings
Hit "Firewall -> General" on the left hand side:
Ensure the following are ENABLED
- Remote Management - port 443 (if you need remote access)
- SIP ALG
Ensure the following are DISABLED
- Block WAN Request
3. Increase UDP Timeout
On certain Cisco models (like RV042), there is a hidden page. Browse to:
Ensure UDP Timeout is 300 seconds and SIP ALG is Enabled: