This solution applies to premium call attempts placed to any service provider.
Premium calling services, traditionally called "900" numbers in the NANPA region, are numbers which allow charging a per-minute, or per-call, fee to the caller for usage.
Traditionally, these service numbers were accessed by dialing 900 + a 7 digit number. Over time, the range expanded to include several 9XX area codes, and to include call redirects to premium numbers. Common methods of premium service delivery are listed below:
- Calling a 9XX-XXX-XXX number to connect (there are also numerous valid standard dial numbers within the 9XX range. 918, for instance, is in Oklahoma)
- Calling a 10-10-XXX-XXXX number to direct to an alternate service delivery.
- Calling to a dial assisted number, such as information, and requesting a connection.
- Calling a toll-free number which forwards to a premium number after playing a message requiring acknowledging the premium charge(s).
Due to the various number of methods for connecting to premium services, and the overlap with valid calling patterns, the only reliable method for blocking these services without negatively affecting desired services is at the provider level.
Barracuda Networks strongly recommends that customers wishing to restrict premium calling services contact their telephone service provider(s) and request that premium services be blocked on the account globally. This method of restriction guarantees that these calls cannot be connected, and will prevent you from being billed for them.
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