asterisk users - Nov 2008 - Set a specific registration expiry value to a given peer without touching defaultexpiry in sip.conf ?

Hi,

I've got several trunks in my 1.6.0.1 setup.
One of them is asking for 1800 sec registrations.

You can provide this value setting defaultexpiry to 1800 in sip.conf but how
can you specify this duration to this specific trunk and not affect the
others ?
An option to register statement in sip.conf would be perfect ...

Regards
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