[SR-Users] Use specific expires per User-Agent

[mayamatakeshi]

Hi,
I have a requirement to specify a REGISTER max_expires based on the
User-Agent.
I checked the docs and it seems there is no pseudo-variable or something
like that would permit this.
I would like to be able to do something like this:
if($ua ~= "Some-UA") {
    $max_expires=100;
} else {
    $max_expires=150;
}
save("location");
Is there some way to achieve this?
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