The Voice T1 and Services Module establishes the Cisco Catalyst 6000 family as the most complete campus multiservice platform available, providing high-end T1 or E1 gateways to the Public Switched Telephone Network (PSTN) or legacy private branch exchanges (PBXs) and network-based voice services.The Voice T1 and Services Module provides transcoding and conferencing services for the multiservice network. Transcoding enables a full voice-compression solution by offering transcoding services to endpoints not capable of supporting compressed voice or a different encoding type to the remote end.