BITS Type using Castle Rock

Hi to everyone.
I need an information. I work using Castle Rock as manager SNMP.
I am implementing the SNMP part of a router.
In the SIP MIB there are several leaves of BITS type. It means having
selected some bits associated for example to the enable notifs.
(Example
SYNTAX BITS {
sipServiceColdStart(0),
sipServiceWarmStart(1),
sipServiceStatusChanged(2)
}
)
When Castle Rock (CR)compiles its mibs, it solves BITs using OCTET
STRING type. So, when I send to it the SNMP message, I use an internal
string type. The problem is that CR displays the ASCII code of the
message: so, for example, if I have enable sipServiceColdStart and
sipServiceWarmStart the displayed value will be 33 and not 3. I mean,
this is not a problem because the sent value is correct, but I would
like to know if it is correct this way.
Thanks in advance.
BR
DANIELE