[Freeswitch-users] UPnP Timeout

I have been using pfSense (1.2.3) and FS. FS nicely uses UPnP to poke holes in the firewall, but it seems that the holes close after a while. I cannot find any documentation in FS nor in pfSense as to what the timeout is. Is there a setting in FS to do some kind of keep-alive thing with UPnP to keep, e.g. 5060, open? Or is it already doing that and pfSense is the issue? Thanks!