IP-enabled DEFINITY System. Avaya IP Telephony

IP-enabled DEFINITY System

Adjunct Location Medium/Large Enterprise - Main Location

IP IP

H.225

C-LAN

MedPro

EPN PPN

H.225 - RAS &

Q.931 signaling

EPN

IP IP

IP Net

RTP

TDM bus

CCMS from processor to port boards across backplane

EPN

C-LAN

MedPro

TDM bus

RTP audio

Enterprise

IP Network

DCP MCC SCC MCC MCC DCP

Analog to

P

S

T

N

CCMS and bearer over TDM or ATM

Center Stage or ATM PNC to

P

S

T

N

Analog

Figure 2: IP-enabled DEFINITY System

- IP-enabled DEFINITY System is the same architecture as before, but with IP port boards added.

- The Control-LAN (C-LAN) board is the call servers’ interface into the IP network for call signaling.

H.225, which is a component of H.323, is the protocol used for call signaling. H.225 itself has two components: RAS for endpoint registration, and Q.931 for call signaling.

- The IP Media Processor (MedPro) board is the IP termination point for audio. As of Communication

Manager 3.0 there is a higher capacity version of the MedPro board called IP Media Resource 320

(MR320). The MR320 supports up to 320 calls, based on licensing, as opposed to a fixed max of 64 calls for the MedPro. These boards perform the conversion between TDM and IP. The audio payload is encapsulated in RTP, then UDP, then IP.

KW Avaya IP Telephony Implementation Guide 9