KVH Industries TracPhone V3 HTS User Manual page 97

TracPhone V3-HTS User's Guide
Troubleshooting
102
Step 6: Try a Different Phone
Disconnect the phone from the ICM and connect another phone in its
place (use a phone that you know is working properly). If you are then
able to place a call with the new phone, the phone you were using is
faulty.
Step 7: Verify the Phone Is Connected Properly
Make sure your phone is connected to the RJ11 "Voice Line 1" jack on
the ICM. Do not use the "Voice Line 2" jack. Only "Voice Line 1" is
enabled for use.