asterisk users - Nov 2009 - Limit IAX calls on a peer, in and out

We have setup an * box for a small client with 10 phones.  They have a
4500/500k ADSL connection which works great when no more than 8 external
calls are in progress. (ulaw)
 
The problem is when all 10 people try to use an external channel, AND/OR, 8+
incoming calls arrive at once.  The symptom when this happens is obviosuly
dropped calls or choppy calls.
 
Of course the ADSL connection is a problem, but I must first deal with the
call drops/choppiness before the client invests in a bigger pipe.  (loss of
client confidence).
 
Is there a call-limit like in sip.conf?  I can dream up a way to limit
outbound calls in my dial macro...but that gets messy and doesn't deal
withinbound.  IDEAS?
 
Thanks,
MD
 
 
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