NSE

NSE (Named Signaling Events) is a proprietary protocol to switch from voice to Passthru, without involving SIP. It uses a proprietary event, based on NTE (see 3.5 Payload Format). So NTE is not proprietary, but NSE is.

TelcoBridges and NSE

We currently only support NSE events:

192 (switch to passthru)
193 (disable echo)
194 (switch back to voice)

References

• Configure Fax Relay with NSE
• RFC 2833
• list of NSE events