FWIW, Here's my lua function function fixupMultiDest(dpDest) -- eg dpDest = "[leg_timeout=15,origination_caller_id_name=mystery caller]sofia/internal/sip:0024307@84.92.90.149:59031;transport=udp,sofia/internal/sip:0024307@37.157.38.162:51910" leg_params, leg_dest_list = dpDest:match("([^]]+)]([^]]+)") leg_params = leg_params.."]" result = "" for leg_dest in string.gmatch(leg_dest_list, '([^,]+)') do if leg_dest ~= "error/user_not_registered" then if result~="" then result=result.."," end result = result..leg_params..leg_dest end end -- eg result = "[leg_timeout=15,origination_caller_id_name=mystery caller]sofia/internal/sip:0024307@84.92.90.149:59031;transport=udp,[leg_timeout=15,origination_caller_id_name=mystery caller]sofia/internal/sip:0024307@37.157.38.162:51910" return result end