Best Telecoms Book

I’m interested in increasing my general telecommunications knowledge for my job so that I can improve my interactions with customers. I’ve been recommended the Irwin Book of Telecommunications Management by James Harry Green, however the most recent edition was published in 2001 so I imagine it’s quite outdated.

Does anyone have any experience with this book or have any other recommendations?

Thanks very much.

I’ve found Newton’s Telecom Dictionary to be very useful at times.

Of course, for general Telephony, you can’t beat, Telecom for Dummies.