ASA 8.0(4) version has Unified Communications Features such as "phone proxy" and "mobile proxy".
Phone Proxy - Phone Proxy functionality is supported. ASA Phone Proxy provides similar features to those of the Metreos Cisco Unified Phone Proxy with additional support for SIP inspection and enhanced security
Mobile proxy - Secure connectivity (mobility proxy) between Cisco Unified Mobility Advantage clients and servers is supported.
CUMA solutions include the Cisco Unified Mobile Communicator, an easy-to-use software application for mobile handsets that extends enterprise communications applications and services to mobile phones and smart phones and the Cisco Unified Mobility Advantage server. The mobility solution streamlines the communication experience, enabling real-time collaboration across the enterprise.