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Managing telephone numbers

On this page:
Manage your telephone number, forward calls internally and keep your telephone book up to date.

Additional phone number(s)

Visit the Customer Center to order additional phone numbers (not possible for SwisscomLine plus): Got to "My products & services" > "Telephony" > "Adjust telephony options"

How many additional phone numbers can i have?

  1. 2 phone numbers: as a customer with All IP (e.g. inOne home with fixed network)  and Swisscom Line basic you can have 2 phone numbers and have 2 calls simultaneously. You need more? Contact us
  2. Up to 5 phone numbers: if you are using  inOne SME Office (with fixed network). you can use a total of 5 phone numbers and hold 5 calls at the same time. You need more? Contact us

Assigning a number to a device

If you use an Internet-Box, you can assign phone numbers to devices as follows:


  1. Enter http://internetbox.home or in your Internet browser and log in. Please note that you only have access to these settings when your home network is connected to your Internet-Box.
  2. In the left menu bar go to “Telephony” > “Settings”
  3. Set which phone number is to be displayed to the call recipient with “Outgoing call”. Use “Incoming call” to set which phone number rings out on the respective devices.
  4. Click on “Save”.

If you have a Centro Business, you can assign phone numbers to devices in the Customer Center:


  1. Log into the Customer Center.
  2. Go to the “Business telephony/device” menu.
  3. Set which phone number should ring on individual devices (you can do this directly on the handsets if they are registered in Centro Business 2.0).
  4. You can set which phone number is to be displayed to the call recipient under “Customise business telephony/calls”.

Forwarding internal calls

If several telephones are registered on your Internet-Box, you can use them to make free internal calls. You don’t need more than one phone number for this. Simply assign individual internal numbers to the phones in the web portal (http://internetbox.home or .



You can also make internal calls and forward them for free with a Centro Business 2.0. Call forwarding on a Nyon HD-Phone, Gigaset SL360HS and Gigaset CL660HX is easy, and you don’t need an additional phone number. However, you do need an additional phone number/line to forward calls on an IP-Phone (e.g. Yealink T46G, Sarnen HD-Phone) with inOne SME Office.


Example with an Internet-Box: Assign the number 201 to your handset in the living room. You can then dial the internal number 201 on the handset in the bedroom to ring your phone in the living room.


You can also forward an external call to another internal handset. Proceed as follows:

  1. Access the menu options during the call
  2. Select “Forward” or press “OK”.
  3. Select an internal number (e.g. 204)
  4. Forward the call

With an Internet-Box, calls can be forwarded from HD-Phone to HD-Phone and from HD-Phones to a phone connected to the Internet-Box telephone line 1 or 2. No other internal forwarding, for instance to a Yealink T46G IP-Phone, is possible.

With an Internet-Box, enter http://internetbox.home or in your Internet browser and log in to assign internal phone numbers. You can select the desired phone numbers at Telephony > Settings. Please note that you only have access to the web portal when your home network is connected to your Internet-Box.


Log into the Customer Center to assign internal phone numbers (short dial) with a Centro Business. You can assign the desired short dial numbers under Business Telephony > My Telephone Numbers.


Entry in the telephone book

Would you like people to be able to look you up in the public phone book? An entry in the official directory ensures your phone number and address are listed in both the printed and electronic phone book. You can register your number and address online and edit or add to the entry at any time (e.g. when you change address, get married, have children etc.).


To prevent your address from being shared with third parties, go to the Customer Center and prohibit the address update. This ensures that your address data is only updated within Swisscom.

Suppressing phone numbers

If you want to prevent your fixed network number or name being displayed to the call recipient, you can suppress your phone number. You will then appear to the call recipient as an anonymous caller.

If you wish to set this permanently for your fixed network phone, please go to the Customer Center. To suppress your number for one call, enter *31, then the call recipient’s phone number, followed by # (e.g. *310449999999#). This additional service is free.

If you wish to suppress your mobile phone number, enter *31#. You can deactivate the service again by entering the code #31#.

Alternatively, you can change the settings directly on your mobile phone. The device manual shows you how to suppress the mobile number on your device. If your device is not listed, try using the manual for an earlier or later model.

Please note: Some call recipients do not allow anonymous calls. In this case, you will be unable to contact this person as long as you suppress the phone number.

Telephone book contacts

If you have a cordless HD-Phone you can access your contacts in the main phone book from various handsets.


With an Internet-Box:

Manage your contacts in the web portal (http://internetbox or You can, change and delete contacts in the “Telephony” > “Phone Book” menu. Please note that you only have access when your home network is connected to your Internet-Box.


The Home app also lets you transfer your contacts from your smartphone to the Internet-Box phone book. The phone book is automatically saved in the Swisscom network and is restored to the default setting following a router change or reset.

You can also carry out the following functions in the phone book menu on your HD-Phone handset:

  • Delete entire phone book
  • Synchronise the Internet-Box main phone book with the handset
  • Enter a new name and number
  • Search for a contact

The main phone book cannot be used with analogue or SIP phones (e.g. Yealink T46G).

With a Centro Business 2.0:

Manage your company telephone directory in the Customer Center. You can manage internal and external phone books with up to 500 contacts with “Business Telephony” > “My Phone Numbers”. Please note that contacts created in the Customer Center cannot be edited or deleted on the handset.



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