| 11. | Trunk lines are used for connecting a private branch exchange ( PBX ) to a telephone service provider.
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| 12. | SIPfoundry spawned the development of sipX, an open source SIP private branch exchange ( PBX ) for Linux.
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| 13. | Such systems may be supported by a private branch exchange ( PBX ) which controls internal communications between telephone extensions.
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| 14. | ISDN signaling is used primarily on trunks connecting end-user private branch exchange ( PBX ) systems to a central office.
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| 15. | Business telephone systems are often broadly classified into key telephone systems, and private branch exchanges, but many hybrid systems exist.
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| 16. | The system would be inserted into the widely used communications routing technology known as the PBX, or private branch exchange.
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| 17. | GPT has 30 percent of the U . K . private branch exchange market, while Siemens's Hicom product has 5 percent.
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| 18. | Mercury moved into the Private Branch eXchange market in 1990 as a result of Telephone Rentals being bought by Cable & Wireless.
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| 19. | The system relies on the PBX _ or private branch exchange _ telecommunications routing technology that is already common in call centers.
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| 20. | "' Vertical Communications, Inc . "'is a corporation that specializes in premises-based private branch exchanges, i . e ., business telephone systems.
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