16.5. Call Number Formats 
Call numbers can be specified in different formats.
| Format | Description | Example |
| Canonical | Begins with + and always includes the country code, area code and the full remaining station number. Blanks and the special characters + ( ) / - : ; are allowed. | +49 (89) 7007-98765 |
| Dialable | Exactly as you would dial the call number on the system telephone in your office, always with the trunk access code. |
|
INFO:
If possible, you should always use the canonical call number format. This ensures
that a phone number is always complete, unique and consistent for networking and mobile
stations in every situation.
When dialing an external station (dialable format) manually, the CO access code must
always be dialed as well. The CO access code must likewise also be specified when
manually entering the destination number (dialable format) for the CallMe service
(UC Suite) in UC clients.
When dialing an external phone number in dialable format from a directory (and when
using the Desktop Dialer and Clipboard Dialer for certain UC clients), the communication
system automatically adds the CO access code (route 1). The automatic addition of
the CO access code also occurs when you select a phone number of your own personal
data (Mobile
number, Private Number, etc.) as a destination number for the CallMe service (UC Suite).
INFO:
For calls within the USA via CSTA to a number in canonical format, phone numbers are
converted to the dialable format.
INFO:
Phone numbers that are stored in local Outlook contacts should not have any non-digital
characters in the last 4 digits and the minimum number of digits for extensions entry
must be 4, otherwise the Exchange server will no be able to search the phoner number
and much the contact you are searching.