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Existing architecture Voicemail ? GSM network GSM users migration IMS Use Case: John Smith manager • John Smith is a successful manager. Being abused by sales agents’ calls, he decides to block them. • This week, he is going to the beach to relax, so calls are managed by a voicemail system. • However, he doesn’t want to miss lucrative business opportunities by not accepting his VIP clients, their calls are redirected to his secretary. • His family is important for him, so he always accepts their calls. Use Case diagram group management blocking calls voicemail system forwarding calls accepting calls privacy management Telephone calls IMS IMS client PSTN GW traditional telephony Call forwarding Call Manager IMS IMS client PSTN GW traditional telephony Voicemail Voicemail Call Manager IMS IMS client PSTN GW traditional telephony Web Interface DB Web Service Web StreamingCall Manager server Voicemail IMS Web browser IMS client PSTN GW traditional telephony
