R2 multi-frequency compelled signalling using a DSP on a network termination card

摘要

A method and apparatus are provided for processing signals received on a R2 multifrequency compelled signalling subscriber channel within a telephone switch. The method includes the steps of disposing a digital signal processor within the telephone switch between an inbound path of the R2 multifrequency compelled signal subscriber channel and a controlling processor of the telephone switch and detecting an R2 multifrequency compelled signalling control transmission by the digital signal processor on the inbound path. The method further includes the steps of responding to the control transmission by the digital signal processor transmitting an acknowledgement on an outbound path of the subscriber channel and transferring a symbolic representation of the control transmission to the controlling processor of the switch.