Thanks for the idea. I just checked:

The phone is a SNOM 300, and silence suppression is set to off.

JM
"Stephen Lewis" <stephen@sock.org.uk> wrote in message
news:47e2429f$0$632$5a6aecb4@news.aaisp.net.uk...
> Mr JM wrote:
>> When I put my phone on mute, I get disconnected aftrer 2 min.... [...]
>
> Does your SIP UA give you the option of disabling silence suppression?
>
> The symptom you describe suggests that your phone is 'pausing' the RTP
> media stream when you put it on mute; it's quite likely that if you can
> persuade your phone to continue the media stream when it's muted, Voipfone
> won't kill the call.
>
> Stephen