| 摘要 |
Network support for blocking certain categories of calls, such as telemarketer calls, is disclosed. One or more network-based call control elements such as may reside within a mobile switching center or central office switch, effects blocking of calls based at least in part on the calling party category. A first call control element receives indicia of a prospective call and determines the calling party category. The first call control element sends a message including indicia of the calling party category to a second call control element, which blocks the prospective call based at least in part on the calling party category. Blocking may occur at the second call control element substantially independently (i.e., without regard to called party preferences) or after querying a subscriber database to determine called party preferences.
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