Cisco 521SG Administration Guide - Page 37

2 Configuring Lines The Cisco SPA IP phones provide different numbers of lines depending on the phone model. Each line corresponds to a phone number (or extension) used for calls. Each line can support two calls. For example, a four-line phone can handle eight calls. One call can be active (in conversation) and seven can be on hold. This chapter contains the following sections: • Configuring a Line Key • Assigning Busy Lamp Field, Call Pickup, or Speed Dial Functions to Unused Lines • Configuring Audio Indication for Call Pickup Event Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 36