0x5D H.323 DTMF Signal Input Received

A DTMF digit received from the PSTN or IP side of a call.

Used in:
PPL Event Indication message

ICB Type | 0x02 (Data)
ICB ID | 0x5D
Data Length | 0x04
Data[0-1] | Digits
Data[2-3] | Duration (ms)

Public Switched Telephone Network
Internet Protocol. Part of the TCP/IP family of protocols used to route messages and tracks the addresses of nodes.
See Programmable Protocol Language.
See Information Control Block.