© 2005 Cisco Systems, Inc. All rights reserved. IPTX v Module Summary Cisco CallManager Express provides the small to midsize business with an integrated solution for call control, voice mail, and data services. Voice may be placed as data in packets through a process of sampling the voice, quantizing the samples, and encoding the value as a binary expression. Packet loss, delay, jitter, and the required bandwidth all must be considered when configuring VoIP. Cisco CallManager Express sets up calls through the use of protocols such as SCCP, RTP, H.323, and SIP.