# Endpoint filter summary

Each MSPP endpoint consists of a single endpoint filter. Endpoint filters provide an entry or exit point (or both) through which data can flow. MSPP endpoint filters include:

Endpoint filter | Description
DS0 full duplex | Provides an entry or exit point for data received from or sent to a PSTN interface. This filter can send and receive simplex or duplex data streams.
RTP IPv4 full duplex | Provides an entry or exit point for duplex packetized voice data streams received from or sent to an IPv4 interface, and performs the following processing tasks: Creates compound packets that contain one or more frames of encoded media. Disassembles compound packets into separate unpacked frames.
RTP IPv4 simplex receive | Provides an entry point for simplex packetized voice data streams received from an IPv4 interface and disassembles compound packets to separate unpacked frames.
RTP IPv4 simplex send | Provides an exit point for simplex packetized voice data streams sent to an IPv4 interface. Also creates compound packets that contain one or more frames of encoded media.
RTP IPv6 full duplex | Provides an entry or exit point for duplex packetized voice data streams received from or sent to an IPv6 interface, and performs the following processing tasks: Creates compound packets that contain one or more frames of encoded media. Disassembles compound packets into separate unpacked frames.
RTP IPv6 simplex receive | Provides an entry point for simplex packetized voice data streams received from an IPv6 interface and also disassembles compound packets to separate unpacked frames.
RTP IPv6 simplex send | Provides an exit point for simplex packetized voice data streams sent to an IPv6 interface. Also creates compound packets that contain one or more frames of encoded media.
T38UDP | Converts T.38 UDP packets into fax data and vice versa (these endpoints do not support IPv6).
TPKT | Provides an entry and exit point for full duplex voice data stream multiplexed according to the ThroughPacket algorithm (these endpoints do not support IPv6).