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It only switches on failure but you could add in a rule for the ports or IP addresses of your VoIP service to always send it over the backup route.
We have a site with a cable connection (which is fast but fails multiple times a day) and a backup ADSL line which is stable but slow.
The main office traffic is left normal going over the cable connection as main and only failing over to the ADSL when the cable connection fails.
However there are three TCP connections on 3 ports that we have a rule to always send over the backup ADSL line. These connections can’t be (or as little as possible) interrupted so it is preferable to send them over the backup all the time.
Tom – http://www.mouselike.org