Global IP Office Technical Tip
158: Limit on length of extension numbers for IP Extensions
*Release Date: 10 January 2007
When using IP Hard Phones (e.g. 4600 and 5600 series terminals) with Avaya IP Office, extension numbers must be limited to 7 digits.
It should also be noted that other limitations may apply - such as those for Compact Contact Centre (CCC) where extension numbers cannot be over 4 digits in length.