Maxim Integrated 73M1866B/73M1966B FXOAPI - Manual (Page 29)

UG_1x66B_046 73M1866B/73M1966B FXOAPI User Guide
Rev. 2.1 29
2.10 Billing Tone Filter Control APIs
2.10.1 M1x66_BillingToneFilterEnable
Description
Large amplitude out-of-band tones can be used to measure call duration and to allow remote central
office to determine the duration of the call for billing purposes. These tones can saturate or distort the
input signal, thus, it is important to be able to reject them. This API provides the ability to filter out the
billing tone.
Prototype
M1x66_RET M1x66_BillingToneFilterEnable (M1x66_HANDLE chanHandle,
M1966_BTONE_FREQUENCY frequency)
Parameters
Data Type Name Description
M1x66_HANDLE chanHandle Channel handle from FXO open channel.
M1966_BTONE_FREQUENCY frequency Frequency – 12 or 16 KHz.
Return Values
Data Type Description
M1x66_RET M1x66_SUCCESS – Successful.
M1x66_FAILED – Failure.
2.10.2 M1x66_BillingToneFilterDisable
Description
This API disables the billing tone filter.
Prototype
M1x66_RET M1x66_BillingToneFilterDisable (M1x66_HANDLE chanHandle)
Parameters
Data Type Name Description
M1x66_HANDLE chanHandle Channel handle from FXO open channel.
Return Values
Data Type Description
M1x66_RET M1x66_SUCCESS – Successful.
M1x66_FAILED – Failure.