The Cisco 2-port G.703 (E1) Voice/Wan Interface Card provide voice and data access to the public switched telephone network (PSTN). This multiflex trunk interface card is single-port trunk interfaces for voice, data, and integrated voice and/or data applications. This E1 multiflex VWIC with G.703 support allow unstructured E1 traffic that conforms to the ITU-T G.703 standard.