I have a Siemens S68H connected to my new Vigor 2850n (firmware 3.6.0_232201) which is set up for 2 SIP VOIP accounts. I have no problem dialing out on the SIP accounts and they show as registered in the Siemens web admin page. The problem is receiving calls - I don't. The phone does not ring and it goes to the SIP account answerphone. Any ideas? - I had it working with a Vigor 2820vn with no port forwarding or special rules. Also I have same set up in another place except a different router and everything works fine. Any advice gratefully accepted! W.