T.38

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According to Wikipedia, "T.38 fax relay standard was devised in 1998 as a way to permit faxes to be transported across IP networks between existing Group 3 (G3) fax terminals. T.4 and related fax standards were published by the ITU in 1980, before the rise of the internet. In the late 90s, [[VoIP]], or Voice over IP, began to gain ground as an alternative to the conventional [[PSTN|Public Switched Telephone Network]]. However, because most VoIP systems are optimized (through their use of bandwidth-saving compression) for voice rather than data calls, conventional fax machines worked poorly or not at all on them due to the network impairments such as delay, jitter, packet loss, and so on. Thus, some way of transmitting fax over IP was needed.
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NSE (Named Signaling Events) is a proprietary protocol to switch from voice to Passthru, without involving SIP. It uses a proprietary event, based on Named Telephony Events (NTE), (see 3.5 Payload Format from RFC2833). So NTE is not proprietary, but NSE is.
  
  
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== TelcoBridges and T.38 ==
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== TelcoBridges and NSE ==
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TelcoBridges provides native support for the T.38 fax relay standard.
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TelcoBridges implementation currently only support NSE events:
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<pre>
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192 (switch to passthru)
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193 (disable echo)
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194 (switch back to voice)
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</pre>
 
== References ==
 
== References ==
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*[http://en.wikipedia.org/wiki/T.38 Wikipedia article]
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*[http://tools.ietf.org/html/rfc2833 RFC 2833]
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*[https://supportforums.cisco.com/docs/DOC-1381 NSE article]
  
  
  
 
[[category:Glossary]]
 
[[category:Glossary]]

Revision as of 10:48, 28 May 2012

NSE (Named Signaling Events) is a proprietary protocol to switch from voice to Passthru, without involving SIP. It uses a proprietary event, based on Named Telephony Events (NTE), (see 3.5 Payload Format from RFC2833). So NTE is not proprietary, but NSE is.


TelcoBridges and NSE

TelcoBridges implementation currently only support NSE events: 

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

References

Retrieved from "https://docs.telcobridges.com/mediawiki/index.php?title=T.38&oldid=10873"
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