asterisk users - Nov 2010 - Sip, Qualify=200 that doesn't qualify. How to signal this state to the Peer

Say,

If bandwidth e.g. ADSL goes fuzzy, is there a way to force * to unregister the
Peers?

I noticed with qualify=200 for example, even if latency goes above and * shows
Lagged and then UNREACHABLE
The peer's calls are still accepted.
Is there a way to automatically prevent this?
Thanks
Shaun
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