The only time I have had a problem with voice lines being close to alarm wires, was when the fire alarm system used a multiplexed loop instead of the good ole fashion EOL circuits. The data being transmited on the polling loop circuit played havoc with our phone system.(Nitsuko DS01 at the time) You could hear the data on nearly every phone in the system. Some burg alarms use multiplexed polling loops as well, but I have never had the situation where a burg panel has given me any trouble.