[Kenthurst35]

I finally got this to work by changing the following:

1. Enabling STUN server (thanks for the tip Ozimarco)
2. Setting Use DNS SRV on the PSTN tab to YES (this solves the GetServerAddrErr message appearing in syslog)
3. On the SIP tab, setting Substitute VIA Addr to YES and Send Resp To SRC Port to YES
4. In my Voxalot account, setting a Call Connection rule that anyone calling my account gets diverted to VM. I also have Symmetric NAT Handling set to No in my Voxalot account

The call routing behaviour I now have is that on Line 1 busy or no answer, my calls go th Voxalot VM. Also, because I have call waiting active on Line 1, the user has the option of picking up the call before it goes to Voxalot.

Note: all CFwd fields on User tab are blank.

Thanks to everyone who contributed to this thread.

Cheers