ATPM
The Address Translation and Parsing Manager provides address translation services based on a database of telephone numbers and corresponding destinations configured through the Network Management Module.
CCU
The Control and Coordination Unit enables the Signaling Protocol Unit (SPU) to set up DSP channels. In addition, the CCU controls the DSP for generating supervisory tone.
CMGR
The Call Manager is called by the PSU at each phase of call establishment and release and at significant events during a call.
CPS
While the Line State Machine (LSS) handles state changes that are unique to a signaling protocol. The Call Processing State machine handles functions that are common across all line protocols.
DIM
All access to the DSP resources within the ITG software system are made through the DSP Interface Module.
DSPA
The DSP Allocator is called by the CCU whenever a call is about to be established to a telephony port.
HSMU
The H.323 Switched Mode Unit provides the capability to set up voice, fax, or data connections over the IP network.
LSS
The Line State machines handles state changes for loop start FXS, FXO, and E&M signaling protocol.
NMM
The Network Management Module handles the configuration of the ITG.
PSU
The Protocol Switching Unit provides the capability to interwork between the H.323 switched mode unit and TCP/IP protocol stack.
RADH
The ITG software incorporates RADVision H.323 protocol for call signaling and control.
SPU
The Signaling Protocol Unit controls the LSS and CPS for facilitating telephony channel signaling.
TIU
The Telephony Interface Unit detects changes in telephony channels, for example, hook state. The TIU also supplies signals, such as loop power denial, to each of the telephony channels, and generates various ring cadences.