I have been running Vonage VOIP with no problems for a few years. Recently it has stopped working and seems to be an issue with the firewall blocking ports 5060/5061.
VOIP works with firewall set to low, but not any of the higher settings.
I have tried port forwarding which worked for a few days and then stopped working.
Any suggestions on how to unblock those specific ports at a high firewall setting?
guy
I’m not sure if Vonage uses SIP/ALG, but the SBG6400 comes with SIP enabled by default. If Vonage does not use SIP/ALG, this may be what causing the issue.
You can try and disable SIP to see if that resolves your issue. If not I would recommend disabling SIP and also try setting up the port forwarding again. The SIP option can be found on the Advanced Options page under the NAT ALG Status section in your SBG6400 GUI.
I tried that and it didn’t make a difference.
It seems to be quite clearly the firewall blocking the required ports.
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