I’m trying to get an attended transfer work with freeSWITCH, but it’s not quite working.  I have Microsoft Speech Server on one side and Televantage on the other. 

MSS is originating a call, which freeSWITCH is bridging to Televantage.  That calls connects just fine.  Then, MSS sends a re-INVITE to Televantage to put the call on hold.  This works too.  Then, MSS originates another call to freeSWITCH, which is again bridged to Televantage.  This works fine too. 

Then, MSS sends a REFER to freeSWITCH to do the transfer.  The transfer should be complete, but there is no audio between the two calls—just silence.  I have looked at pcaps and the freeSWITCH logs, but I’m not seeing anything obviously wrong. 

After the REFER, I can see audio for both calls going between freeSWITCH and Televantage, so it seems that the only thing missing is freeSWITCH routing the audio from one call to the other call and vice-versa.

Any help would be greatly appreciated.  I have a pcap and the freeSWITCH logs, and I can easily reproduce this. 

Thanks!

John