With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
cjnAtPortIndex
Cajun At Port Index
1.3.6.1.4.1.52.4.43.2.4.11.2.1.1
A unique value for each AppleTalk port. Its value is between 1 and the total number of AppleTalk ports. The value for each port must remain constant at least from the re-initialization of the entity's network management system to the next re-initialization.
Back to APPLETALK-PRIVATE-MIB MIB page.
IPHost Network monitor allows you to monitor cjnAtPortIndex on Avaya device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Avaya IP phones right now.