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1 Cisco IP Phone 7940 Provides two programmable line/feature buttons capable of four simultaneous calls and four interactive soft keys that guide a user. - ppt download
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3c. Cisco IP Phone 7960/40 Administrator Guide for SIP, Version 4.0 - Product Overview (Version 4.0) [Cisco SIP IP Phone Software] - Cisco
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Cisco SIP IP Administrator Guide, Version 7.5 - Installing Cisco IP Phone 7960G/7940G Hardware on the Desktop or Wall [Cisco SIP IP Phone Software] - Cisco
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