Known Issues:
- SIP ALG is enabled by default, causing intermittent call and phone feature failures.
- This router is capable of DNS proxying, when turned on it causes intermittent registration failures on Polycom phones.
- While this device does have the ability to turn off SIP/ALG and DNS Proxy, recent testing has shown that this does not resolve the overall issue.
- This device lacks the ability to maintain UDP session integrity and therefore cause general call quality issues.
- Since this device is also managed by the Internet Service Provider, neither the customer nor VoIP provider are made aware of ISP changes.
- If this device is reset by the Internet Service Provider, original issues will return.
- In light of the above issues, it is therefore recommended that these devices be bridged to a recommended router.
- Note that this is the stock firmware for this router. Do not confuse this with the incompatible Arris Comcast Xfinity TG852G or Arris Comcast Xfinity TG862G & TG862G-CT Gateway YN3720.
Resolution:
- Click on LAN setup
- Check (enable) DNS override
- Set the Primary DNS Server IP to 8.8.8.8
- Set the Secondary DNS Server IP to 8.8.4.4
- Uncheck (disable) DNS Relay
- If this device is your only router, NAT mode should be set to "RoutedWithNAT". If this router needs to be bridged then NAT mode should be set to "Bridged".
- Click Apply
- Click on Firewall
- Disable (uncheck) Ping blocking.
- This step is needed for to allow the router to respond to our Call Quality Monitoring and Troubleshooting Servers, 64.28.122.110 and 64.28.121.110.
- Click Apply
- Go back to Firewall. Click on ALG.
- Uncheck SIP
- Click Apply
- Reboot router and phones.
Additional Resources:
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