You can not make calls from a port of the quintum to another port of the quintum and go VOIP.
The cheapest way to do such a testing is having a little ATA 186, or by that means any VOIP phone .
Then you connect the ATA to the internet, sends calls VOIP to the A800 over the internal network or internet and test your ports/equipment that way.
If you are on the US, there is another way.
Write to mike3799@yahoo and I pass the details.