macro ael-std-exten-ael( ext , dev ) {
        Dial(${dev}/${ext},20);
        switch(${DIALSTATUS}) {
        case BUSY:
                VoiceMail(b${ext});
                break;
        default:
                VoiceMail(u${ext});
        };
        catch a {
                VoiceMailMain(${ext});
                return;
        };
};