The measurements performed by the analog trunk ports in the Branch Gateway are based on some of the more common Centralized Automatic Reporting On Trunks (CAROT) test lines: Test 100, Test 102, and Test 105.
The Test 100 line answers an incoming call, sends a 1004 Hz tone at 0 dBm for 5.5 seconds, and then remains quiet until it is disconnected.
The Test 102 line answers an incoming call, sends a 1004 Hz tone at 0 dBm for 9 seconds, and then remains quiet for 1 second. The line repeats the 1004Hz/quiet sequence until disconnected.
The Test 105 line answers an incoming call, then:
Sends a 1004 Hz tone at -16 dBm for 9 seconds
Remains quiet for 1 second
Sends a 404 Hz tone at -16 dBm for 9 seconds
Remains quiet for 1 second
Sends a 2804 Hz tone at -16 dBm for 9 seconds
Remains quiet for 30 second
Sends a 2225 Hz tone (progress tone) at -16 dBm for half a second
