Spoofing has also become common in telephony. Callers transmit a telephone number (caller ID or A number) for which they have no usage rights. For example, as the caller ID, callers use a Swiss number that is assigned to an end customer (police, hotline, company number, etc.) or that has not yet been assigned. Both are clear cases of misuse.
Spoofing poses a danger because the callers are assuming a false identity and the calls are answered because of the deception. The callers often have fraudulent intentions. It is also possible that customers whose phone number has been misused could receive annoying call backs despite not being responsible for the original call. A company or authority’s reputation could be damaged by this.
The Anti-Spoofing option for Enterprise SIP allows organisations to protect their phone numbers. To do this, they configure the option for each number block individually in the Enterprise SIP application in My Swisscom Business, directly within the Swisscom network. The option is configured for entire number blocks rather than individual numbers.