[Asterisk-Users] ISDN/SS7 book?

[Roy Sigurd Karlsbakk]

hi

some time ago, I asked the list of a good book for learning ISDN and 
SS7. I don't need to know how to write a channel driver or something; I 
just want to know more about the possibilities and what's really sent 
back and forth. I was told the book "ISDN and SS7: Architectures for 
Digital Signaling Networks" by Uyless Black (ISBN 0132591936) was a 
good choice, but this seems sold out. Does anyone know about another 
book about the subject?

thanks

roy