User A
has the internal number 323. Two numbers are assigned to this user. One is a Dortmund number (+49 231 1234-323) and the other is a Munich number (+49 89 6623-14). This user can therefore always be contacted via his Munich number, even when he is in Dortmund.
If the user calls a number in Munich from Dortmund, his call can be forwarded via the gateway (trunk) in Munich and, therefore, his number in Munich (49 89 6623-14) indicated to the caller.
Other internal callers dialing from anywhere in the company can contact him at any time via his internal number (323).
