Speedtouch 780 - incoming calls connect, then silent!

I'm not sure if this is the right forum for this but maybe someone can help...

I've got a regular telephone handset connected to an o2 SpeedTouch 780 router, and all works according to plan. If I dial out to a number, the call is fine. When anyone calls (from another VoIP, mobile or landline) the call connects fine and then goes silent after about a minute. It's consistent and a real problem - as soon as anyone calls I need to get their number so I can call them back.

Anyone any suggestions? I don't know if it's a hardware problem or not. I've got plenty of bandwidth with o2, solid 7-8Mbps down and 1Mbps up at all times. I don't want to invest in a new sip handset when I don't know that the handset's the problem....

Thanks :)

Re: Speedtouch 780 - incoming calls connect, then silent!

Can you check that it is set-up like this please:


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