Call Barring Feature — [2021]

Block all outgoing international calls or roaming calls to avoid massive unexpected charges.

In traditional Global System for Mobile Communications (GSM) networks, Call Barring is defined within the GSM 02.88 and 03.88 specifications. It operates as a supplementary service managed by the Home Location Register (HLR) and the Visitor Location Register (VLR). call barring feature

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The mechanism involves specific error codes sent back to the switching center (MSC) when a barred condition is met. For example, if a user attempts to dial an international number while "Outgoing International Barring" is active, the network intercepts the setup message and returns a release cause, typically Cause Code 55: "Incoming calls barred within the CUG" or generic call barring rejection messages. Here’s a short story built around the phrase