Acknowledgements
The authors of this book would like to extend their thanks to colleagues working in 3GPP and IETF for their great efforts in creating the IMS specifications and related protocols. The authors would also like to give special thanks to the following who helped in the writing of this book providing excellent review comments and suggestions:
Erkki Koivusalo, Hannu Hietalahti, Peter Leis, Tao Haukka, Markku Tuohino, Juha Räsänen, Peter Vestergaard, Tapio Paavonen, Kalle Luukkainen, Pavel Dostal, Jozsef Varga, Martin Öttl, Thomas Belling, Ulrich Wiehe, Krisztian Kiss, Hans Rohnert, Antti Laurila and Adamu Haruna.
The authors want to especially give thanks to Hisham Khartabil and Aki Niemi for the very good team work and their excellent and major contributions during the first two editions, without which this book would not have been possible.
The authors welcome any comments and suggestions for improvements or changes that could be used to improve future editions of this book. Our e-mail addresses are:
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