[Freeswitch-users] Any experience with DTMF from FreeSwitch to Sonus with Vega ATAs?

Steve Underwood steveu at coppice.org
Sun Feb 20 13:04:59 MSK 2011

On 02/20/2011 03:31 PM, Yehavi Bourvine wrote:
> Hello,
>   Anyone has an experience with the above configuration? All sides are 
> marked as RFC-2833 and the Sonus recognises most of the DTMF's twice.
> The Vega sends both RFC-2833 events and about 60msec of the DTMF tone 
> (according to Vega's engineers it takes it about 60 msec to detect the 
> DTMF tones).
> According to the RFC this is acceptable. The service provider I am 
> working with says that it shouldn't be like that. Before I waste time 
> in wars, has anybody had this issue and knows whether it is a matter 
> of configuration at the Sonus side?
>                                    Thanks! __Yehavi:
Are you saying the Vega sends 60ms of DTMF as audio, then sends RFC2833 
DTMF packets and mutes the audio? In what reading of the RFC is that 
considered appropriate action? In addition, a DTMF detector should 
detect is more like 40ms. 60ms is rather long.


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