3Com VCX V7000 Installation Manual page 155

for performing authentication, authorization, and certain user-specific
functions
IP address of the primary Auth & Dir Service
The primary IP Messaging Service provides voice mail and other messaging
services . In some configurations a dedicated IP Messaging Server runs this service.
Authentication and Directory Service tasks are associated with the eth0
network interface. Enter the IP address of eth0 on the Primary IP
Telephony Server.
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