SIP TA
Expert function
This function should be configured exclusively by experienced IT specialists, as errors due to lack of knowledge can inevitably lead to critical security vulnerabilities, which can negatively affect both the customer installation and the Swisscom reputation!
The Centro Business features an integrated SIP Terminal Adapter (SIP-TA). This allows IP telephones to be registered directly on the router and the subscribed numbers to be used.
The SIP-TA provides local SIP credentials for this purpose, with which compatible IP phones or soft clients in the local network can be registered on the Centro Business. This allows the router to function as a local SIP instance and support IP telephones as well as analog/ISDN terminals in parallel.
Goal and Purpose
Any SIP phone (Session Initiation Protocol) or soft client (VoIP software) uses a Swisscom number registered on the Centro Business.
Configuration of the B2BUA in the Centro Business:
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On the router portal, under the menu item VoIP, select Basic settings (VoIP) and click on "Change" for the desired number.
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The IP telephone number and the authentication username are fixed and are to be used as such in the SIP telephone/soft client.
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The arbitrary authentication password can be changed or used as is in the SIP telephone. Saved passwords are persistent thanks to "Easy Activation" and thus available again even after a reset.
Configuration of the SIP telephone
The following SIP credentials must be entered in the SIP telephone/soft client used: For registration on the SIP-TA, the following access data must be entered in the SIP telephone or soft client:
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IP telephone number
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Authentication username
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Authentication password
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IP address of the registrar (local IP address of the router)
Further required parameters are configured according to the operating instructions of the respective SIP telephone or soft client.
Prerequisites
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At least one number must be registered on the Centro Business.
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The telephony LED lights up white or green depending on the landline subscription.
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The SIP phone or soft client supports the usual SIP standards (RFC 3261).
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Free configuration of SIP credentials on the SIP phone or soft client is possible.
FAQ - SIP-TA
What is a SIP-TA or Back-to-back user agent (B2BUA)?
The Back-to-Back User Agent (B2BUA) is a Voice over IP (VoIP) software component in the Centro Business that acts as an intermediary between the central Swisscom VoIP Application Server (VoIP AS) and any SIP client. It controls connection establishment, signaling, and media streams during a VoIP call, thereby ensuring smooth communication.
What are the password requirements for an "IP telephone entry" for SIP-TA usage?
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Minimum 8 characters, maximum 128 characters
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Minimum 1 lowercase letter
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Minimum 1 number (only 1-9)
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Not allowed are all uppercase letters and special characters, l (lowercase L) as well as the number zero (0)
What needs to be considered when changing router models (Centro Business 2.0 to Centro Business 3.0)?
With the introduction of the Centro Business 3.0, password security for the B2BUA authentication password was revised. Instead of the phone number being preconfigured as the password (as was the case with Centro Business 2.0), this easily guessable password is replaced by a more complex password. If SIP had already been used with the phone number as the password, the new authentication password must be taken into account when commissioning the Centro Business 3.0. If the password already met the requirements before the model change, the existing password is adopted.
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