Ryan Courtnage wrote:

... to it.  In other words, Asterisk isn't passing along the duration of
the original event.

Correct.

Is this by design?  Can * be made to pass on the initial event duration?

It is by design, i.e. not accidental. There is no way to pass on the duration at this time, because incoming events are turned into AST_FRAME_DTMF as they pass through the Asterisk core, and those frames do not currently have any way to carry duration information. Keep in mind that Asterisk is used in many applications that are not SIP<->SIP, so just because in your situation there is an 'incoming event duration' that doesn't mean there is in all other applications :-)

.. where we are unable to pass variable duration DTMF events to the
switch, because Asterisk does not send along the duration.  Our primary
issue is that the duration is simply too short.

There are a great many (most) PBXes that don't support variable DTMF event duration at all, so Asterisk is no different in this regard.
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