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DTMF via MCU

Topology:

Video Endpoints x2 •à SIP •à VCS-C •à SIP Ad-Hoc MCU 5320 •à SIP Audio Conference Bridge CUCM

Right now I have ad-hoc multiway working great on my video units. If a unit calls into the audio conference bridge first does all the DTMF and joins the conference then adds and merges video endpoints everything is fine. The challenge is if they do it in a different order.

For example let’s say they merge 3 video endpoints together then add the audio conference, the audio conference which is hosted off of CUCM which VCS-C has a SIP connection to never hears the DTMF tones to join the conference. The audio conference only supports RFC 2833 and the SIP trunk from VCS-C to CUCM is set to only support RFC2833.

Is it possible to have the MCU 5320 send RF2833 DTMF out, even if it’s to all participants in the conference that wouldn’t matter. My main goal here is I want them to be able to join the audio conference in any order, dialed first, last or anywhere in-between.

Thanks,

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