asterisk users - Jul 2006 - Disconnection During Incoming Call

It seems my system is dropping my IAX2 trunk.  I've turned on full 
debugging to attempt to capture the problem.  System A sends a call, to 
system B. which I am connected to.  I am on the phone.  The ring group 
hits by other line, and I get disconnected from the call I am on.  Here 
is the debug capture:

Jul 31 10:09:43 WARNING[22218] ast_expr2.fl: ast_yyerror(): syntax 
error: syntax error, unexpected TOK_EQ, expecting TOK_MINUS or TO
K_COMPL or TOK_LP or TOKEN; Input:
IAX2/ = Local
      ^
Jul 31 10:09:43 WARNING[22218] ast_expr2.fl: If you have questions, 
please refer to doc/README.variables in the asterisk source.
Jul 31 10:09:43 DEBUG[22218] pbx.c: Expression result is '0'
Jul 31 10:09:43 VERBOSE[22218] logger.c:     -- Executing 
GotoIf("IAX2/yyy-2", "0?s-BUSY|1") in new stack
Jul 31 10:09:43 DEBUG[22218] pbx.c: Not taking any branch
Jul 31 10:09:43 DEBUG[22218] pbx.c: Expression result is '1'
Jul 31 10:09:43 VERBOSE[22218] logger.c:     -- Executing 
GotoIf("IAX2/yyy-2", "1?s-BUSY|1") in new stack
Jul 31 10:09:43 VERBOSE[22218] logger.c:     -- Goto 
(macro-exten-vm,s-BUSY,1)
Jul 31 10:09:43 VERBOSE[22218] logger.c:     -- Executing 
Wait("IAX2/yyy-2", "60") in new stack
Jul 31 10:09:43 NOTICE[22218] chan_iax2.c: I should never be called!
Jul 31 10:09:49 DEBUG[2570] chan_iax2.c: Immediately destroying 1, 
having received INVAL
Jul 31 10:09:49 DEBUG[2570] chan_iax2.c: Immediately destroying 1, 
having received INVAL
Jul 31 10:09:49 DEBUG[22209] channel.c: Didn't get a frame from channel: 
IAX2/yyy-1
Jul 31 10:09:49 DEBUG[22209] channel.c: Bridge stops bridging channels 
SIP/3087-0031 and IAX2/yyy-1
Jul 31 10:09:49 DEBUG[22209] chan_iax2.c: We're hanging up IAX2/yyy-1 now...
Jul 31 10:09:49 DEBUG[22209] chan_iax2.c: Really destroying IAX2/yyy-1 
now...
Jul 31 10:09:49 VERBOSE[22209] logger.c:     -- Hungup 'IAX2/yyy-1'

Notice, "I should never be called!".  I am sure this is the problem. 
Of
course you can see the system tears down the IAX2 trunk.

I am using Asterisks at Home on system B either 2.6 or 2.7 (I am not 
sure how to tell the version of Asterisk@Home).  AMP Version 1.10.010
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