[SIPForum-discussion] what is an RED payload type(Redundant payloadtype)????

Johansson Olle E oej at edvina.net
Wed Nov 28 15:35:25 UTC 2007

28 nov 2007 kl. 09.06 skrev Gunnar Hellström:

> There are two RED payloads.
> text/red is defined in RFC 4102 and described in RFC 4103. It  
> increases reliability of real-time text transmission for text  
> communication with good live flow as it is typed.
> Sent text is repeated twice in packets coming after, usually  
> together with new text, so that packets can be lost without loss of  
> text.

We will soon have that in Asterisk!

> audio/red is defined in RFC 2198. It increases reliability of audio.
It seems to be used quite often for T.38.

How many devices has implemented audio/red today? Any special  
situations? Would this be
something we need to implement in Asterisk?

Best regards,

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