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Call Forward Call forward allows a user to configure a Cisco IP Phone, so all calls that are destined for it ring another phone. Three types of call forward exist: Cisco CallManager System Guide OL-7135-01 40-33 Chapter 40 Cisco IP Phones Phone Features • Call forward all—Forwards all calls. • Call forward busy—Forwards calls only when the line is in use and busy trigger setting is reached. • Call forward no answer—Forwards calls when the phone is not answered after the configured no answer ring