Variable length extension dialing or abbreviated dialing is supported as long as the extension is assigned within your company. Extensions can be from 2 to 6 digits in length. The last 4 digits of the user's telephone number is automatically assigned to each user. Site-to-site extension dialing is also supported provided that extensions do not overlap.
• The user's extension cannot conflict with special services numbers. As a result, the following numbers cannot be assigned as extensions: 00, 011, 211, 311, 0311, 1311, 411, 0411, 1411, 511, 611, 0611, 1611, 711, 811, 911, 0911, 1911.
• If the last 4 digits of the user's telephone number conflicts with a 4-digit special services numbers, the extension will be left blank when the user is provisioned. If an extension number is required, any nonconflicting 2 to 6-digit number can be assigned by the site administrator in the My Site dashboard.
Note: all Cloud PBX devices expect a minimum of 10 digits to be dialed before the call is launched to the Cloud PBX servers. As a result, there may be a 3 second delay between the time the last digit of an extension was dialed and the time the call is launched. There are two ways to avoid this delay:
• dialing a # after the extension number
offhook the phone after the number is dialed (if applicable)