Nortel ISDN Signaling Link, Описание, установка и эксплуатация

Страница: 64 / 380

Page 64 of 378 Description
553-3001-202 Standard 1.00 April 2000
A RADIUS client on the ITG ISL Trunk card allows per-call statistics of the
IP network call to be sent from the cards to a network listener. The client is
based on RFC2139, which defines the accounting portion of the RADIUS
protocol. The ITG ISL Trunk card uses the authentication algorithm based on
RFC1321.
Configuration
Use MAT to configure the following RADIUS parameters:
• Enable/disable RADIUS record generation
• IP address of the RADIUS listener
• IP port number of the RADIUS listener
• Key for authenticating RADIUS records (the key is maintained between
the RADIUS client and the RADIUS server)
Data is configured at the ITG node level and is distributed to all ITG ISL
Trunk cards associated with the node.
Messaging
The RADIUS client sends two records to the network listener: one when the
call is answered and one at the end of the call. The messages are sent by the
Follower card which processes the voice call (not the DCHIP or Leader if
they are not handling the voice data). The RADIUS protocol uses UDP for
message exchange. The client sends a message to the listener and waits for an
acknowledgment. If no acknowledgment is received, the client re-transmits
the record using the standard exponential backoff theme. The data is stored
on the card until an acknowledgment is received. When an acknowledgment
is received, the data is discarded. The client stores a maximum of 100 records.
This allows two Start and two End records for each of the 24 ports.
Start record
The Start record is sent when the call is answered. It contains the following
fields:
• Calling party number,
• Originating IP address and port,
• Called party number,