ISDN

0x0005 L3P Call Control*

0x0006 L3P D Channel Control

0x0007 L3P B Channel Control

0x0008 L3 Call Reference

0x0009 L3 Global Call Reference

0x000A L3 D Channel Control

0x000B L3 B Channel Control

0x0091 V5 L3P PSTN

0x0092 V5 L3P BCC

0x0093 V5 L3P Manager

Setting up, monitoring, and tearing down calls.
Data channel. One of two fundamental components of an ISDN interface, it provides a path (16Kbps for BRI, 64Kbps for PRI) for carrying control signals and call data in a packet-switched mode.
Bearer channel, 64Kbps (ISDN) The channel that carries the actual payload (as opposed to D-channels, which carry signaling data that helps route the payload).
Public Switched Telephone Network