Avaya R300 User Manual

Issue 1

November 2000

Overview of the Avaya R300 Remote Office Communicator 

6

DEFINITY to remote office signal flow 

Signaling messages (as part of call processing) are sent from the Switch Processor 
Element (SPE), across the internal DEFINITY backplane bus, and forwarded to the 
C-LAN module. From the Ethernet output of the C-LAN board, the signaling information 
is wrapped in IP packets and sent across the WAN over to the Avaya R300. The Router 
Engine in the Avaya R300 directs these wrapped signalling packets across the API to the 
Remote Angel (on the Combo Blade).

For a main site supported, digital station set, the bearer information is communicated from 
the digital line card (for example, DCP) onto the DEFINITY TDM backplane bus and sent 
over to the IP Media Processor. The Media Processor performs the TDM to IP gateway 
conversion per the H.323V2 protocol.

The IP based bearer stream is communicated across the WAN to the Avaya R300. The 
Avaya R300 receives the IP stream and routes it to its internal VOIP gateway, where the IP 
Voice stream is converted back to TDM and passed to the Cmombo Blade. Then the 
Combo Blade transforms this into an I-channel of the DCP communication channel and 
sends it to the DCP digital station.

 depicts the detailed signal stream flow of the control messages, voice bearer 

channels, and the system management flows between the main DEFINITY site and the 
Avaya R300.