I have set up my 2130vn and its working fine VoIP calls are working both ways but with 2 issues
1. the incoming call goes to engaged instead of the Panasonic phones answerphone
2. there is an echo to the caller

I can live with the echo as its slight but would like to get the answer phone function working ,and up to now haven't found a comprehensive guide to set the voip side of this router up
I know its a old model but its was in an unopened box and I picked it up for a great price ,what and where are the settings to change to get the call to pass through the router and activate the panasonic's answerphone ?