[Freeswitch-users] Exchange 2007 UM - DTMF problem

[Michael Jerris]

It is an rfc violation to start at 0.  Thats a bug in your other  
device.  In regards to the volume, it should not matter, we set it  
based on what we had seen on a lot of other devices, we should  
probably make that pass through in the same way we do duration.  I  
doubt either of these is the problem.  Take a closer look at the pt  
used for 2833 compared to what we negotiated, see if anything is amiss  
there.  We have had people successfully interop with exchange before,  
if they could chime in, also, check the wiki as there is a page there.

Mike


On Jun 28, 2008, at 3:19 PM, UV wrote:

> We’re almost done testing the (initial) interoperability between  
> Freeswitch and the Exchange 2007 Unified-Messaging server. I’ll be  
> happy to share our conclusions once we’re done.
>
> I have a couple of questions in this regards:
> I’ve noticed the FS RFC2833 DTMF doesn’t work. It does work once the  
> call placed in either bypass_media or pass-rfc2833. I’ve found the  
> difference between the two scenarios was in the “RFC 2833 RTP Event”  
> payload:
> Working scenario: Event Duration starts from 0
> Non-working scenario: Event Duration starts from 160.
> Is that by design or a bug? If by design, how do I change that so  
> the FS will start from 0?
>
> I’ve also found the Volume setting’s different: on FS it’s hardcoded  
> 7 (/src/switch_rtp.c, line 1047: “rtp_session- 
> >dtmf_data.out_digit_packet[1] = 7”). Other devices usually use 10.  
> Any reason for that number? Just curious.
>
> Cheers,
> UV
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