[cisco-voip] RightFax SIP/T38 and DTMF

[Scott Voll]

are you using t38?  or fax passthrough?

Scott


On Wed, Dec 5, 2012 at 7:24 AM, Jason Aarons (AM) <
jason.aarons at dimensiondata.com> wrote:

> RightFax sending fax across SIP Trunk to CallManager that had Device >
> Trunks to 2811 that have Early Offer ****
>
> ** **
>
> Faxes fail.  Seeing CallManager Software MTP being invoked.****
>
> ** **
>
> “RigthFax doesn't support any type of DTMF, whereas the SIP Trunk supports
> ****
>
> RFC2833, the CUCM understands this as a mismatch and allocates the MTP:***
> *
>
> MTP_DHSCCMSUB4. Below the initial INVITE coming from Rightfax where you can
> ****
>
> see inside the SDP there is no DTMF attribute”****
>
> ** **
>
> ** **
>
> Anyone aware of this and if RightFax has a fix to for RightFax to include
> DTMF attributes in their SIP SDPs so MTP doesn’t get invoked?****
>
> ** **
>
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