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Control codes allow direct access to the telephone system’s functions. The following codes apply:
| Code | Description | 
| #+n | Use outside line "n" to call the telephone number ("n" replaces the “0” otherwise required to access an outside line) | 
| *1 | Start and end voice recording (if this function is enabled for the extension) | 
| *10+profile number | Activation of the call forwarding profile | 
| *11+TN | Permanent call forwarding to telephone number (TN) | 
| **11 | Cancel permanent call forwarding | 
| *12+TN | If not available, forward to telephone number (TN) | 
| **12 | Cancel call forwarding if no answer | 
| *13+TN | If busy, forward call to telephone number (TN) | 
| **13 | Cancel call forwarding if busy | 
| *14+TN | If not registered, forward to telephone number (TN) | 
| **14 | Cancel forward if unregistered | 
| *2+Speed dial | Directly dial the extension/telephone number via speed dial | 
| *3 | Pick up the last call ringing in the pick-up groupe | 
| *3+EXT | Pick up call coming in to the extension (EXT) | 
| *490 | Activate call waiting | 
| **490 | Deactivate call waiting | 
| *5 | If busy, automatic callback activated | 
| **5 | If busy, automatic callback deactivated | 
| *55 | Specify primary device within a premium extension (Premium Package) | 
| *72+nnnn1 | Call skill service | 
| *73+nnnn1 | Call eFax additional costs will occur | 
| *74+nnnn1 | Call time control nnnn | 
| *75+nnnn1 | Call group nnnn | 
| *76+nnnn1 | Call announcement nnnn | 
| *77+nnnn1 | Call queue nnnn | 
| *78+nnnn1 | Call conference service nnnn | 
| *791 | *791 Access voice mail for this extension with password *791158 Access voice mail for extension 158, with the password for 158! *11*791 Transfer your calls to your voice mail *11*791158 Transfer your calls to the voice mail of the extension 158 | 
| *792 | Access voice mail entering extension number, e.g. for remote enquiry | 
| *8 | Call Pull seamlessly between devices and clients | 
| *80 | Activate intercom | 
| **80 | Deactivate intercom | 
| *80+NST | Intercom to extension (EXT) | 
| *84+nnnn1 | Become member of the queue with service ID nnnn | 
| **84+nnnn1 | Leave queue with service ID nnnn | 
| *85 | Echo extension | 
| *86 | Block caller ID (CLIR) | 
| *860 | Show main number as telephone number | 
| **86 | Show telephone number incl.direct dial (CLIP) | 
| *87 | Subscribe to Skill-set | 
| **87 | Unsubscribe to Skill-set | 
| *9+Project Number | Define a project number for outbound calls. (Note: The project number is only valid for the very next outbound call) | 
| Function codes for conference rooms during an active conference. | |
| ** | Help | 
| *2 | Activate or deactivate mute. | 
| *3 | Express your needs. | 
| *5 | Activate or deactivate mute of all participant. | 
| *6 | Lock the conference. | 
| 1) nnnn is the four digit Service ID with leading zeros (0). For example, in a callgroup, IVR, eFax, etc. This means: is the Service ID "1", "0001" must be entered when entering the function code. | |
