[Freeswitch-users] Is RFC 4733 supported ?

Steve Underwood steveu at coppice.org
Thu Apr 23 08:17:09 PDT 2009

Michael Jerris wrote:
> rfc 4733 attempts (and fails miserably) to clarify rfc2833.  It 
> doesn't "really" change anything of any real substnace.  Our handling 
> of these packets tries very hard to be strict in what we send and 
> loose in what we accept and we tend to interoperate pretty well with 
> most endpoints.  That being said, there are some very broken endpoints 
> out there (such as sonus) that require special hacks, some are 
> automatic, some require settings.  All that being said, we should be 
> very compliant with both 2833 and 4733, although you will generally 
> see references in settings refer to 2833.
RFC4733 largely tries to clarify RFC2833 for the DTMF features. However, 
for most other signal it is very incompatible with RFC2833.


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