<p>I found a work-around - I assume there is a new branch created when the contact is using TCP because the following fixes it</p>
<pre><code># User location service
route[LOCATION] {
        [...]
        # per subscriber ring time
        if ($avp(s:ring_time) != $null) {
                # xlog("setting time out to $avp(s:ring_time)");
                t_set_fr($avp(s:ring_time) * 1000);
                t_set_max_lifetime($avp(s:ring_time) * 1000, 0);
        }
}
</code></pre>

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