e4d47c27__DataSheet_for_product_XE2422H__description
[pin] 12 [name] /INT [description] 
/INT provides an active low hardware interrupt signal from the XE2422H. The operation of this interrupt pin is programmable using registers SE2 and S08. /INT can be programmed to indicate Loss of Carrier, Wake-on-Ring, Loss of Loop Current, or Shared Line Activity. Once triggered the /INT line remains active until cleared by the AT:I command.
Cermetek DataSheet for product XE2422H
description