| 摘要 |
A method is provided for reserving trunks on a trunk group for designated class of service calls. The trunks available for a denominated class of service is specified, and the trunks remaining are enumerated and designated as of no class and available for all calls. When the no class trunks are in use and a new call is a denominated class of service, it is allocated to a trunk and the trunks available is reduced accordingly. If the no class trunks are in use and a new call is not of a denominated class of service, the new call is allocated to a further trunk group. When a call is released and the number available is reduced below a specified number, the number of available trunks increases. If the number of trunks available is not reduced below a specified number, the released trunk is made available for all calls.
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