You searched for "intercom module"
Brainboxes
Brainboxes ED 582 Data Acquisition, 4 Channel(s), 16 bits
Part: ED-582
Four-channel 16-bit data acquisition module for compact industrial measurement applications.
Siemens
Siemens Data Acquisition, 4 Channel(s)
Part: 6GK5004-1GL10-1AB2
Four-channel Siemens industrial data acquisition module with network connectivity.
Digilent
Digilent USB-CTR04 Data Acquisition, 4 Channel(s), USB, 32 bit
Part: 6069-410-057
USB data acquisition device with four counter inputs for event and pulse measurement.