Hi,   My in-laws decided to upgrade to PlusNet fibre last autumn but wanted to keep the landline number. After doing some research on this forum we decided to sign up with Andrews & Arnold for VoIP calls. The number ported over fine and I set it up to forward calls onto a mobile until I was next at theirs.   Further research suggested that a Cisco SPA122 was a good ATA box to purchase which I was able to set up and get working when visiting at Christmas.   Out going calls work fine but incoming calls are very inconsistent, some make it through to the home phone but a good number go straight to the mobile forwarding which it set up to divert after 9 seconds.   The Andrews and Arnold support team are very responsive by email and have suggested a few settings I should check/change but none have made things anymore reliable.   The latest suggestion was to make the Cisco box have a static IP address (which it already has) and turn off UPnP on the router - which I've done.   I then asked if changing to a different ATA box would help but the response was: "I don't think another ATA will make any difference here we're seeing the device rejecting those calls so it appears that either the configuration is right on the device or your underlying broadband isn't correctly directing the incoming calls to the ATA."   So can anyone suggest any other settings I can look to change on either the router or SPA122?   Many thanks   Ed ... View more