Mobile Operators are currently implementing 3GPP Release 4 - some vendors call this also IMS Release 4. Interestingly IMS was introduced in 3GPP in Release 5 and improved in R6 and now in R7, which will be frozen in June 2007. ETSI TISPAN has finished R1 last year and is currently working on R2. Since they now will merge with 3GPP, R2 may never be finished as such and the first complete IMS will be 3GPP R8 frozen somewhere in 2009 and deployed in 2011. This will approx. also be the time when IMS...