More functions/services
Step by step
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*503=Keypad dialing?
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Wait for the dial tone and enter the code for example, *97 for Do not disturb on. If necessary, make further entries; refer also to the user guide for dial pulse/DTMF phones.
Dial the external number.
You can only perform one function/establish one outgoing connection at a time.
The connection is cleared as soon as the function is successfully activated.
In the case of an external call, the connection is cleared as soon as one of the call partners hangs up.
Using functions in ISDN via code dialing (keypad dialing)
If authorized (contact your service personnel), you can access ISDN functions in some regions using codes.
Press the key shown.
Confirm the option shown.
Enter the required trunk number (contact your service personnel).
Entering a code for required ISDN function (contact your service personnel).
Contact your network provider to find out which ISDN functions can be
Siemens Enterprise Communications
GmbH & Co. KG shall not be liable for damages/ costs which may be incurred by fraudulent activi- ties or remote operation (such as toll fraud).
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