I'm desperately trying to stay away from getting all calls
through a b2bua and I would appreciate some help.

This is the scenario:

  - Two simple SIP phones with no user interface except
  the 12 numbers and symbols are having a dialog.
  - The dialog information may be monitored with the
  dialog event package.
  - I would like to break in to this call and redirect it to
  a IVR/conferencing service where different prompts
  may be played and/or a third party could mix in to the
  media stream on one side of the call.

How should I be able to transfer both sides to the IVR service?

1)INVITE/Replaces cannot be sent to both UA:s since the dialog
will be terminated by the first successful INVITE/Replace.

2)INVITE/Join looks promising but the mixing is controlled by
the UA receiving the INVITE/Join. In this case I would like
the UA sending the INVITE/Join to redirect the call to a
specified service url.

Is there any possibility for a third party to force a dialog
into a specified mixer?

Of course, in this scenario the third party is known and
trusted by the UA:s

/Henrik Gustafsson
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