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5.5 EMM specific procedures
5.5.4 eCall inactivity procedure
5.5.5 Tracking area update request message (for N1 mode only)
5.5.6 Attach request message (for N1 mode only)
5.5.3 Tracking area updating procedure (S1 mode only)
5.5.1 Attach procedure
5.5.2 Detach procedure