Configure Fax Passthrough NSE A

To enable passthrough with NSE, follow these steps:

1. Make sure "Enable Fax/Modem Relay" is enabled.
2. Make sure "Detection Mode" is Standard.
3. Make sure "Relay Mode" is Passthrough.
4. Make sure "Enable switching to FAX relay upon CNG tone" is checked.
5. Make sure "Detection type" is "Silence Suppression off"
6. Make sure the Codec is the same as the remote end.
7. Make sure "Use NSE" is checked. By unchecking this option, you will switch to Fax Passthrough using SIP re-INVITE.