The present document specifies the stage 3 of the Signalling application for the mobility management service for the
phase 1 of Call Forwarding on Not Reachable (CFNRc) supplementary service. The mobility management service
functions include Cordless Terminal Mobility (CTM) for CTM phase 1 (DECT/GAP limitation) and DECT access to
GSM via an ISDN user-network interface at the T reference point or coincident S and T reference point (as defined in
ITU-T Recommendation I.411 [4]) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol.
Stage three identifies the protocol procedures and switching functions needed to support a telecommunication
service (see CCITT Recommendation I.130 [2]).
The Call Forwarding on Not Reachable (CFNRc) supplementary service enables a served user to have the network
redirect to another user calls which are addressed to the served users ISDN number. After the Call Forwarding on Not
Reachable (CFNRc) supplementary service has been activated, calls are forwarded only if the served users cordless
terminal is not reachable. The Call Forwarding on Not Reachable (CFNRc) supplementary service operates on all calls.
The served users ability to originate calls is in principle unaffected by the Call Forwarding on Not Reachable (CFNRc)
supplementary service.
NOTE: Practically the served users ability to originate calls is affected if there is radio congestion or if the served
users cordless terminal is for example out of radio coverage.
The signalling application for phase 1 describes the mobility management procedures required to allow users of cordless
terminals to be mobile within and between networks. Whenever radio coverage is provided and the cordless terminal has
appropriate access rights, the user is able to make calls from and to receive calls at any location within the network.
The signalling application for phase 1 is applicable to the telephony 3,1 kHz t (...abbreviated)