Could you recommend some good reading materials related to JAIN SLEE? Or Java in Telecommunications in general.
There aren't that many books on the topic, honestly.
I'd rather recommend that you look for good material online, but these 2 books are OK (fair warning: we had them lying around at my office a few years ago - I worked for a telco company for a short period of time, but I'm not expert in this field at all):
I like how things in telco, healthcare or multimedia (and others) are always "next-gen"...