[cisco-voip] DTMF relay with Verizon SIP Trunk?

[Nick Matthews]

The digit drop keyword should only be added if you're doing in-band
(2833 NTE) to out-of-band (SIP notify, kpml, h245 alpha/signal).

This makes the router pull the RTP packet out of the stream when it
sends the out of band message.  If you have SIP-SIP with 2833-to-2833
this will cause a DTMF failure.


-nick

On Thu, May 28, 2009 at 12:02 PM, Jason Aarons (US)
<jason.aarons at us.didata.com> wrote:
> I assume this is the correct DTMF relay for a Verizon SIP trunk.
>
>
>
> Using CallManager 7.0(2), no MTP resources, SIP Trunk to CUBE 12.4(24)T with
> SIP to Verizon.
>
>
>
> At first we had below, then I realized DTMF was working;
>
> dial-peer voice 797 voip
>
> no dtmf-relay h245-alphanumeric h245-signal cisco-rtp
>
> dtmf-relay rtp-nte digit-drop
>
>
>
>
>
> Does faxing/VG224 have any dtmf-relay requirements?  I understand they were
> using rtp-nte digit-drop but changed it for some unknown reason to
> h245-alphanumic which I understand is only for H323.
>
>
>
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