Cisco made a large scale release with CallManager 4.0. Included in this release were numerous new features. Previously IP phones were restricted to only 2 calls per any given line appearance. This caveat was eliminated and IP phones could now have a user configurable maximum (up to 200) number of calls per line appearance. Other features and enhancements of note added during this release were, Hunt group, Malicious call identification, Immediate diversion, Privacy for shared lines and Call barge.
Improved security with media encryption between phones, Multi Level Administration (MLA) allowed delegated administration and Direct transfer allowed a user to select two calls from the same line and connect them together. Call join allowed users to select several calls from a line and conference them together.
Later in the same year Cisco released a minor platform revision as Cisco Call Manager 4.1. This version focused on improved stability and support for even more features. Several utility tools were added as well. Additionally, some of the new features of CCM 4.0 include greatly enhanced conference calling features, enhanced Client Matter Code (CMC) and Forced Account Code (FAC), Multilevel Precedence and Preemption (MLPP) and Malicious Call Identification (MCID). The Dialed number analyzer (DNA) was also introduced which allowed administrators to analyze how dialed strings route calls. CallManager 4.1 also enhances the encryption capabilities first introduced in CallManager 4.0. Additional security enhancements when using Cisco Phones 7940/7960/7970 or 7971 it is now possible to encrypt signaling as well as voice traffic itself.