[Freeswitch-users] BLF for Sip gateway?

I am setting up a small PBX with freeswitch / debian etc I am using Linksys SP3000 ATA to interface with the PSTN. In/Outbound calls work. I would like to set up a BLF to show if the PST N line is in use, I can configure it on the phone (Yealink T23G) and associate it with the PSTN extension (191) and if I dial 191 from another extension the lamp shows busy (and I am connected to the PSTN line...) However it doesn't show busy for inbound PSTN calls, nor for calls routed to the PSTN gateway via the dialplan (using action = bridge to <pstn number>@<SP200 ip address>:5061) - the calls do get connected to the PSTN. Is there a way to make this work - perhaps by setting the presence within the dialplan actions? David