With IPHost Network Monitor you can run simple snmp requests against a Avaya device in your network.
cjnAtPortStateNetEnd
Cajun At Port State Net End
1.3.6.1.4.1.52.4.43.2.4.12.3.1.5
The last AppleTalk network address in the range currently used for this port. This is a two octet DDP network address in network byte order. If the network to which this AppleTalk port is connected is a Phase 1 network or a non-extended network, the value for atportNetEnd shall be two octets of zero.
Back to APPLETALK-PRIVATE-MIB MIB page.
IPHost Network monitor allows you to monitor cjnAtPortStateNetEnd 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.