SIP Credentials

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Learn about and how to set up, manage and delete SIP Credentials. Also find frequently asked questions on SIP Credentials.

What are SIP credentials?

SIP credentials allow you to use your Swisscom fixed network number on devices and VoIP clients from third-party providers or on Swisscom SIP telephones if using at a different location (nomadic use). They comprise a user name, an authentication name and a password. SIP credentials are linked to the relevant fixed network number and are confidential.

SIP credentials are unique to each fixed network number. Once configured on devices or VoIP clients from third-party providers or on Swisscom SIP telephones, they make it possible to make calls anywhere in the world. These calls are charged in accordance with your fixed network subscription and appear on your invoice. There are no additional charges for using SIP credentials. The costs are identical to normal fixed network calls.

Set up

To be able to use your SIP Credentials with devices and VoIP clients from third-party providers or on Swisscom SIP telephones, please follow the link bellow to My Swisscom (Customer Center).

To activate your SIP credentials, you first have to log on using two-step authentication. This consists of your Swisscom Login and an authenticated mobile number. You will be taken through the steps required if your mobile number is not yet authenticated. Once you have requested your SIP credentials you will receive an SMS with a user name, authentication name and password.

The information provided below must be entered in the devices (excluding Swisscom SIP telephones) or VoIP clients from third-party providers:


User name
You receive your fixed network number by SMS
Authentication name
You receive this by SMS
You receive this by SMS
Outbound Proxy

Swisscom does not provide detailed configuration instructions due to the very high number of devices and third-party VoIP clients available. Swisscom does not offer technical support for SIP credentials for the same reason. If you require support for end devices or VoIP clients from third-party-providers, please contact the product manufacturer directly.

Manage and delete 

SIP credentials must be handled with the same care as a bank card. Anyone who knows your SIP credentials can make telephone calls charged to you from anywhere in the world; these will then appear on your bill. The customer is responsible for ensuring that SIP credentials remain confidential. 

If you think that your SIP credentials are being used by someone else, delete them on My Swisscom immediately. 

If you give away or sell your telephone, make sure that the SIP credentials are removed from the device. Reset the device to factory settings in advance.
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Frequently asked questions

Your phone service is interrupted briefly when SIP credentials are activated. If the service is still interrupted after 3 minutes, please press the reset button on the Swisscom router for a few seconds.

SIP end devices that support compromised codec, such as G.722, must support the RFC 4733 method for DTMF transmission. This RFC method is configured on all Swisscom end devices. “In-Band” DTMF (known as “Audio” for Gigaset) only works with G.711 and “SIP INFO” is not supported by Swisscom. We recommend configuring RFC 4733 or its predecessor RFC2833.  

Swisscom does not provide technical support for SIP credentials. If you require support for end devices or third-party VoIP clients, please contact the product manufacturer directly.

Die nomadische Nutzung eines Swisscom SIP Telefons HD-Phone Yealink T46G, HD-Phone Sarnen, HD-Phone Rousseau with base station ​will no longer be automatically supported from 3 May 2021. To still use a Swisscom SIP telephone at a different location, please use SIP credentials.

Note: the SIP credentials will be transferred to the Swisscom SIP telephone automatically, provided that it is connected to your router at home or at work.

SIP credentials are compatible with lots of end devices and third-party VoIP clients. Swisscom does not accept liability for proper functioning and security. It is the customer's responsibility to select a device or software from a reputable supplier.

All calls are billed according to your fixed network subscription. The costs are identical to normal fixed network calls. If you use a mobile app, we recommend that you purchase a Data Travel package to avoid roaming charges and keep your costs under control.

Both allow the use of a Swisscom fixed network number: but in different situations:

  • Local SIP is used to register IP-compatible devices and VoIP clients with the Swisscom router.
  • SIP credentials on end devices and VoIP clients from third-party providers or Swisscom SIP telephones connect directly to the Swisscom network.

The SIP credentials are not usually deleted during a software update. If you have problems after an upgrade, go to My Swisscom, click on Fixed network > "My telephone numbers" > "Manage SIP credentials". Select “renew” to receive new SIP credentials.

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