Blocked Call

A block call results when a call cannot be connected. The two most common reasons for blocked calls are when all lines or trunks to the central office or exchange are in use, or all paths through a PABX (Private Automatic Branch Exchange) or switch are in use. Another example is that of specific services such as premium rate where users request that their local carrier blocks such calls in order to avoid incurring charges.


  • Fully interactive 3GPP based network map
  • Narrated call flows
  • Detailed network procedures

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