IAX2 and Asterisknow 1.7.0

I have just installed Asterisknow 1.7.0 with Asterisk 1.4.31 and FreePBX 2.7.

I am having trouble configuring IAX2 trunks. I have configured them identically to the configuration I am using with 1.4.22 but cannot get them to function correctly, Asterisk is sending a reject message in response to incoming calls. (I can see this with wireshark).

Has anyone experienced this difficulty? If so would be grateful to know how the problem was overcome.

Thanks in advance.

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