# LPS non-editable parameters

This topic describes parameters that are signaling specific.

Caution: | Most of the parameters that follow are signaling specific. Changing their value invalidates any approval certificate for the used board and can cause the board to malfunction. These parameters are described here for reference purposes only.

Field | Type/Unit | Default | Description
--- | --- | --- | ---
CIDalertmaxtime | ms | 0 | Maximum duration of an alert signal in caller ID protocol (if CID is enabled).
CIDmaxwaittime | ms | 8000 | Maximum time to wait for caller ID to arrive before concluding the caller has hung up (if CID is enabled).
CIDminmarktime | ms | 100 | Minimum duration of the mark signal of the caller ID protocol that is interpreted as such.
CIDtype | integer | 0 | Type of caller ID protocol, if CID is enabled: 0 - BellCore CID protocol 1 - NTT Japan CID protocol 2 - ETSI Ringing Pulse Alerting Signal CID protocol
dialtonemintime | ms | 1000 | For outgoing calls, the minimum duration of non-precise dial tone required before dialing will begin. Set this to 0 to disable non-precise dial tone detection. (Precise dial tone detection is controlled by NCC.START parameters). To comply with CTR21 standards, do not modify GER, GBR, or FRA parameters.
dialtonewaittime | ms | 5000 | For outgoing calls, the maximum time to wait for initial dial tone. To comply with CTR21 standards, do not modify GER, GBR, or FRA parameters.
freqdeglitchtime | count | 26 | For frequency-selective ring detection, deglitch time in 1/8 ms. Range is 2 to 80 (0.25 to 10 ms).
freqringhigh | Hz | 54 | For frequency-selective ring detection, the maximum frequency recognized. To comply with CTR21 standards, do not modify GER, GBR, or FRA parameters.
freqringlow | Hz | 16 | For frequency-selective ring detection, the minimum frequency recognized. To comply with CTR21 standards, do not modify GER, GBR, or FRA parameters.
freqringperiods | count | 4 | For frequency-selective ring detection, number of periods of the ring frequency needed to qualify. Range is 1 to 8.
freqtolerance | percentage | 10 | For frequency-selective ring detection, frequency tolerance.
interringmaxtime | ms | 8000 | Maximum length of an incoming ring period (on time + off time) that can elapse before the call is considered to be abandoned.
polaranswertime | ms | 0 | Wait time after going off-hook answering a call before the TCP starts detecting the loop current polarity reversal on far-end disconnect (if reversalmode = 2 or 3).
polardialtime | ms | 0 | Wait time after dialing before starting the loop current polarity reversal detection (if reversalmode = 1 or 3).
qualloopoff | ms | 10 | Minimum duration of loop current interruption before a hang up is recognized.
qualreversal | ms | 200 | Qualification time for loop current reversal event.
qualringoff | ms | 100 | For voltage-sensitive ring detection, the minimum duration of loss of detected voltage to be recognized as the end of a ringing signal.
qualringon | ms | 6 | For voltage-sensitive ring detection, the minimum duration of detected voltage to be recognized as the start of a ringing signal.
releaseguardtime | ms | 1000 | If the host places a call immediately after releasing a call, the line is not taken off-hook until this time has elapsed, to ensure that the CO considers the line idle. To comply with CTR21 standards, do not modify GER parameter.
ringdetectmode | mask | 1 | Selects whether the ring detector is voltage-sensitive or frequency-selective: 0 - Voltage-sensitive 1 - Frequency-selective
ringsigmaxtime | ms | 3000 | Maximum duration of a detected incoming ringing signal before the ringing is considered to be too long.
ringsigmintime | ms | 100 | Minimum duration of a detected ring signal before the ring signal is considered valid.

Refer to LPS editable parameters for more information.