Surely it can't be that, as the call has been answered.
Well its worth a try 
And it was positive advice, rather than my not offering anything
What is the signalling doing at the other end ?
What I'm not sure about is what the different call references are about ?
The setup has a call ref of 0x01
But the Call Processing has 0x81
The far end then sends a disconnect
Neil J. McRae wrote:
Maybe Niel's right and it's a 56K with embedded signalling vs. 64K
with separate signalling.
Or maybe it's the parity. Afer all, 0x81 is 7bit even