This Technical Tip is to inform customers about a known issue when downgrading 1600 series telephones.
1600 series telephones downgraded from firmware version 1.3.4 or 1.3.3 to 1.3.2 will cause the unique Media Access Control (MAC) address and serial number provided on the manufacture label to be converted to default values (MAC = 00:1B:4F:13:70:08, SN = 123456789012).
All 1600 series telephones downgraded from 1.3.3 or 1.3.4 to 1.3.2 will be affected; resulting in phones having the same MAC (duplicated) address. Telephones in this condition cannot be recovered in the field and must be returned to Avaya.
This issue will be addressed in a future release of telephone firmware. For further information please see Avaya PSN004134u: