# Call gapping

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**Call Gapping** is a [load control](/source/Load_control) method for restricting [telephone traffic](https://en.wikipedia.org/w/index.php?title=Telephone_traffic&action=edit&redlink=1) on a [telephone network](/source/Telephone_network) to particular destinations. It is used to protect switches against call processing overload. There are a number of algorithms available to achieve this.

- Crawford gapping works by blocking calls for a determined period of time (the gap size). After the period of time passes, another call is allowed through. Another gap is then started and the process repeats until the overload condition is resolved.

- [Leaky Bucket](/source/Leaky_bucket) gapping creates a queue into which new call attempts are placed. Calls are handled from this queue at a pre-defined rate. Any new calls arriving at a full queue are rejected.

- Proportional Bidding rejects a pre-defined percentage of call attempts.

For a rejected call, an announcement may be played.

Call gapping is not to be confused with [Silence suppression](/source/Silence_suppression).

## External links

- [Comparison of call gapping and percent blocking for overloadcontrol in distributed switching systems and telecommunications networks](https://ieeexplore.ieee.org/document/81746/;jsessionid=4892BB91D2F93220333A4F1184A87187?tp=&arnumber=81746) (abstract)

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Adapted from the Wikipedia article [Call gapping](https://en.wikipedia.org/wiki/Call_gapping) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Call_gapping?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.