I have made a point to point connection between two ATA-186 units (so, no GK in the play). I could make two simultaneous calls (G.723.1 - LBRCodec=RxCodec=TxCodec=0). I think this will not help you any much, but that's the result I have so far. The datasheet says it can't support two concurrent G.729A calls though.
By the way, in the near future, I'll have to go for a GK. I wonder whether it was tricky or easy for you to configure the 3640 to deal with the ATA-186.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
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CUCM Database Replication is an area in which Cisco customers and
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