Alright so after experimenting with this, it doesn't seem to work reliably (though I may be using it wrong). Roughly half of the time everything works fine and both parties are joined together. The other half of the time the bridged leg doesn't make it to the conference (but also stays active). This is the httapi response I'm providing:

<document type="xml/freeswitch-httapi">
   <work>
      <execute application="export" data="hangup_after_bridge=false" />
      <execute application="export" data="api_on_answer=uuid_transfer ${uuid} -both 'conference:2ee73476-aea4-4f85-861f-287f90a42275++flags{mintwo,dist-dtmf}' inline" />
      <execute application="export" data="ringback=${us-ring}" />
      <execute application="bridge" data="sofia/external/sips:number@sip.trunking.provider.com;transport=tls" />
   </work>
</document>

Would appreciate any insight.

Best,
Colin

On Wed, Jun 1, 2016 at 12:13 PM Colin Morelli <colin.morelli@gmail.com> wrote:
Awesome - this is exactly what I was looking for. Don't know how I missed it.

Thank you!

Best,
Colin

On Wed, Jun 1, 2016 at 12:08 PM Abaci B <abaci64@gmail.com> wrote:
one way to do it would be to use api_on_answer to execute a uuid_transfer -both to transfer both legs to the conference (make sure to set hangup_after_bridge to false).

On Tue, May 31, 2016 at 4:59 PM, Colin Morelli <colin.morelli@gmail.com> wrote:
So, I'm trying to setup certain calls such that they enter into a conference asap. I have the process working using bridging conferences right now, which is okay, but bridging conferences forces the dialing leg of the call to go to an answered state immediately, while the bridge leg is still ringing. So, while everything seems to work correctly, it messes with some of my reconciliation/reporting process with another database that are fed off of channel state events. Essentially it looks like every call was answered. 

So I was curious to know if there's a way to make a call that creates a bridged leg, and then as soon as the leg is answered immediately joins both legs into a conference. Is the only way to do it to listen for the channel_bridge events and then transfer the call myself?

Best,
Colin

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