The REGISTER message is needed for the activation or inquiry of call-independent supplementary services. Example: the activation of Call Forwarding. In this case, sending of a REGISTER message impolies that a new Transaction Identifier is assigned and the dialog between MS and the network is established. *) Uplink messages have two
possible IDs because of the SSN (Send sequence number).
[2GTS 04.08 / 3GTS 24.008] For all SS-messages
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