NEC UNIVERGE NEAX 2000 IPS Reference Manual page 280

Chapter 14 Common Channel Inter-Office Signaling (CCIS)
For DtermIP to DtermIP connection via CCIS (Peer to Peer connection), the voice data is
transmitted and received directly between DtermIPs via Intranet (CCIS via IP). For Dterm IP to
Legacy terminal connection via CCIS, the IP-PAD card is required to transmit and receive the
voice data. This card is used to control and convert the voice to data. The control signals are
managed by the MP card in either of the connection above.
The illustration below shows a system outline of CCIS Connection.
System Outline of a CCIS Connection
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