I talked to Sangoma about this several months ago. They said it was on their road map, but, not at the top. This is a sweet feature to have available on a PRI. We wrote code to do this on a Dialogic system several years ago, still works great. It was not too difficult to do. You need the Call Reference Value of the two calls, then you invoke a facility command, and it is done. The calls have to be answered or in the alerting stage to succeed. We may make a stab at this for Freeswitch when we get a better grip on it. I have a spec I can try to dig up for you if you would like.

Maybe it is making some progress moving up on the Sangoma list.

On 1/27/2011 5:16 PM, Holger Esser wrote:

Hi, does anybody have a detailed description of how to implement the TBCT transfer method with Sangoma cards?
I was looking at the att_xfer but I am not sure if that would cover TBCT.

Any suggestions would be greatly appreciated.

Holger
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