IP address subnet delegation

Hi, I had Genuity delegate a small subnet over to us, that being the network
block 4.21.122.32/27 to ns1.ksl.com for which I am responsible.  I have the
correct entries in my named.conf and in my /var/named/zone file. I can
perorm reverse lookups on these IP addresses within my own network, but on
the outside or through any other name server I cannot do reverse lookups.
I (thought I) followed RFC 2317 style delegation, but no one outside can yet
perform reverse lookups. 
Could it be that my syntax is off? Probably is. Here is how I set it up.
Here is what I have in my /etc/named.conf file running the latest Red
Hat using the most recent BIND.

zone "122.21.4.in-addr.arpa" IN {
        type master;
        file "zone/4.21.122";
        };

And here is what I have in my zone file "4.21.122"

$TTL    28800
; $ORIGIN 32-27.122.21.4.in-addr.arpa.
@               IN      SOA     ns1.ksl.com.    hostmaster.ksl.com. (
                                2003052901      ; SERIAL  = (YYYYMMDDXX)
                                10800           ; REFRESH = Every 3 Hours
                                3600            ; RETRY   = After 1 Hour
                                604800          ; EXPIRE  = After 1 Week
                                86400           ; MINIMUM = TTL of 1 Day
                                )

                                IN      NS      ns1.ksl.com.
                                IN      NS      ns2.ksl.com.

61      IN      PTR     inside.moremusic104.com.
62      IN      PTR     mail.bicdc.com.
; EOF


Any suggestions or clarifications on why this might not be working
wopuld be helpful. Everything looks good on my end and when I restart
the named process, all is well there.
Just looking for some information. Thanks.
KJ