I would be great to have an option to separate internal and external calls.
All my clients will have a 3 digit internal call extension. i.e. 442.
When the need to make external calls they need to use the "0" to get the external line.
If the number is only a 3 digit number the JITSI client should not use the "0" for external calls.
If the number is longer than 3 digits than JITSI should use automatically dial "0" within the background for get the external line and dial out.
This option should be optional for the user because some PBX's will cover this feature
User can define the length of the internal Numbers
User can set the Number for get external calls i.e. "0"