Tadiran Telecom Coral IPx 800 Series Installation Procedure And Hardware Reference Manual page 362

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5 Ringer Database Programming
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Max Ringers (Route: SFE,2)
The maximum number of SLTs that can be fed ringing simultaneously from each
PS19 AC is 20, by default. This value can be altered via the Coral database's System
Features (Route: SFE,2) branch, by changing the MAX_RING parameter value.
See Chapter 6 of the Program Interface and Database Reference Manual for details.
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Coral IPx 800 Installation Manual