cisco asa 5510 firewall

We have a cisco asa 5510 that needs a little configuration work doing to it. VPN access has already been created and working. As a video conferencing company we need to be able to make sip and h323 calls inbound and outbound of our network and this is where we having some issues and we therefore need SOMEONE QUALIFIED to have a look at the firewall whilst we make h323 and sip video calls and confirm if any ports are being blocked on the firewall. Remote access is already available to the device. Moving forward there will also be more work for the right individual. We will also provide the eventual freelancer with access to a video client so that we can communicate without issue. therefore well spoken english is a must, you must also have good references. This is 2 - 3 hours work max therefore i expect the price to reflect this. We also need this doing ASAP