Clarification regarding RFC 1406 and RFC 2495

Hello,

I am currently responsible for maintaining the E1 MIB as part of a
module I am working on.
With respect to this, I needed the current status of RFC 2495(dated Jan
'99) - it has been listed as a proposed standard, while RFC 1406 is an
Internet standard (dated Jan '93). 
Which RFC should I follow for my implementation?

I would really appreciate any help in this regard.
Thanks,
Minti