[Asterisk-Users] *, Sipura, Call-Waiting, X100P, 2 ZAP Calls

[Boater]

Does call-waiting work for anyone that recieves 2 pstn calls on a X100P using a Sipura?
 
I have modified the dialplan in the Sipura such that the *0 is definately getting sent to the Asterisk server now. 
 
When the phone beeps and I flash hook I get tone, then dial *0# and the sip debug shows that *0 was acknowledged but I get a rapid busy back from Asterisk.