to send ring voltage to the station.. build your trunk as a cot, start type imm.. the build a rlb pointing to that route, then add a dsc pointing to the rlb.. might need to play with start type but that is the way i would attempt to build a workaround..
you can't switch the field phone to common battery? i know local battery is what makes field phone work but the ones i played with could use the common battery mode..
ta-312 (1969-76) usmc
john poole
bellsouth business
columbia,sc