- Voice DSP module
- enhanced service module (SM-X)
- for Cisco 4451-X; Integrated Services Router 4321
PVDM modules support ad hoc and meet-me conferencing with various codecs in conjunction with Cisco Unified Communications Manager and Cisco Unified Communications Manager Express.
The PVDMs support transrating, in which the same codec is repacketized in order to connect dissimilar networks that have different codec packetization periods.