What have you tried?
I understood the CGL is a set of specifications for a linux to be considered "ready" for telecommunications rather than an actual distro by itself.
I doubt you'll find carrier grade web servers or java platform (enterprise or other edition) which will explicitly meet the standards since these are not intended (directly) for telephony. Though one could use, say, sun java, to create CGL compliant applications.
Of course - you could be thinking of something different?
Linuxes will generally run apache and sun java just fine though.