TAPI for snom Help:
snom 190

> The snom 360 supports additional parameters like: "local", "remote" and "call-id". If these parameters are not supported by snom phone (e.g. snom 190), the TAPI driver will scan the log files to get the remote caller-address. The TAPI driver also scans the log files to detect "connected" and "disconnected" for snom 190. The scan interval is 1,5 sec. Hint: The TAPI driver clears the log file in some call states to minimize the data traffic and to avoid resulting speech gaps.