Connection error from external host

G’day y’all.

I’m very new to asterisk, but have got it working to a point where I have 6 internal extensions all talking happily, pluis I have a connection to an external VOIP host (Freshtel in Australia) for maiking external calls.

I find that I’m able to have asterisk register with my account, and the Freshtel Firefly client running on another system shows me as being online with Freshtel.

The immediate problem I have is that, when that client attempts to connect to me, asterisk rejects the call with the following message:

chan_iax2.c: Rejected connect attempt from, who was trying to reach ‘87644678@’

Clearly I have something amiss somewhere in my configuration files, but I really haven’t a clue where to start withj this one.

Any suggestions good people?

Thanx in advance for your help.