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Calls from and to PSTN will be handled by a SIP PROXY server located in the Service Provider network. Download Free Cisco CallManager Express (CCME) Graphical User Interface (GUI) files We provide free direct download and instructions on how to install CCME GUI on your CCME router. Get free demos, compare to similar programs & view. The Cisco Call Manager Express product can be used as the telephony SIP trunk gateway between the local IP telephony network and the IP Telephony Service Provider. Review of Cisco Unified Communications Manager Software: Pricing information, system overview & features. Ciscos CallManager software provides the necessary functions of call-processing, signaling, and connection services for an AVVID IP telephony solution.