How to assign an extension number
With an extension number, all users within your account can reach each other without dialing the full phone number. Additionally, extensions are required for using presence status. If you're using snom phones, you'll also need extension numbers to configure the Busy Lamp Field (BLF).
Only administrators can assign extensions. Users can have multiple internal extensions but only one extension per routing.
Assigning an extension to a user
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Open the account settings and navigate to the Users section.
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Select the user you want to assign an extension to.
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Click Edit, then select Add Extension.
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Enter the desired extension number.
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Click Save, then exit the editing mode.
Note: For mobile phones, extensions should always be three or four digits long.
Assigning an extension to a group
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Open the Groups section in the account settings.
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Select the group you want to edit.
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Click Edit Routing in the Visual Routing interface.
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Add the desired extension number.
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Save the changes.
Navigation Path: Account Settings ➔ Groups ➔ Select Group ➔ Edit Routing ➔ Add Extension
Unavailable extension numbers
Certain extension numbers cannot be assigned due to technical limitations. The following numbers, or any extension beginning with these digits, are unavailable:
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110 (Emergency number in Germany)
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111 (Emergency number in New Zealand)
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112 (Emergency number in Germany)
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113
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114
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115 (Government directory in Germany)
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116
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117
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118
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119
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211
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311
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411
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511 (Hotline numbers in the USA)
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611
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711 (Long-distance operator in the USA)
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811
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911 (Emergency number in the USA)
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999 (Emergency number in the UK)
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9900–9999
Dialing an extension
All users within your account can call each other using their assigned extensions. To call an extension, dial the extension number followed by *, then initiate the call. For example, to call extension 44, dial 44*.