Solution to one way traffic problem and being cut off after a few seconds of the call.

That is an issue with NAT traversal. Could you please try each of the following as your outbound proxy? It will be best if you could try both inbound and outbound calls with each one to see which one works best. Because the suitable outbound proxy will depend on your ISP, router, network, etc.

nat1.aql.com port 5082 (nat1.aql.com:5082)
sip.aql.com port 5060 (sip.aql.com:5060)

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