Cisco IE-3000-8TC Administration Guide - Page 319
Tip Ring Voltage Adjust, Finish, PSTN To SPA Gain
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Connection Settings Settings PSTN To SPA Gain Ring Validation Time Tip Ring Voltage Adjust Ring Indication Delay Operational Loop Current Min Ring Timeout On Hook Speed Ring Threshold Current Limiting Enable Ringer Impedance Line In Use Voltage Description This field defines the amount of digital gain/attenuation, in decibels (dB) applied to the signal sent from the PSTN to the SPA8800 device. Increase this value if parties on the PSTN side are difficult to hear by parties on your system or lower it if they are coming across too loud. Range is -15 to 12 dB. This field defines the smallest amount of time required by the SPA8800 device to recognize a signal sent across the PSTN connection as a ring signal. If a call from the PSTN is not signaling a ring by a phone on your system, try increasing the validation time until a phone on your system rings. This field defines the amount of time to wait prior to the ring indication occurring in a signal coming across the SPA8800 device. Some amount of time, dependent on country, is required for caller ID to be recognized for the call. Increase this time if a call that is supposed to have caller ID is not showing anything on the display. Decrease it if a ring appears to be occurring late or appears to be cut off. This field defines the minimum loop current that maintains the device in an off-hook state. If the current is lower than this value, the device will enter an on-hook state. This field defines the maximum time allowed for the ring to cross between the higher and lower thresholds. It is expressed as the maximum allowed 1/f in which f is the ring frequency. This field defines the speed with which a call goes from off-hook to on-hook when the phone is hung up. This field defines the minimum voltage that can be detected as a ring. This field controls the current alarm threshold. This field sets the ringer impedance. Certain countries, like South Africa, require a low ringer impedance. This field sets the voltage that must be maintained across a line to designate that the line is in use. This parameter should match the value used by the PSTN. Click Finish to complete adding a PSTN connection to Cisco Business Edition 3000 server. You can add up to 300 connections. OL-27022-01 Administration Guide for Cisco Business Edition 3000, Release 8.6(4) 299