asterisk users - Jan 2007 - Agent Pre Acknowledgement Message

I'm trying to wean my self using the Agent channel in Asterisk. The main 
reason I use it is for the callback acknowledgement , where the user 
presses # to finally acknowledge the call. I have implemented this in the 
Dialplan using the Macro in the docs. This works well as long as the user 
enters something. 

However if the user hangs up , then both sides of the bridge call are hung 
up as well , i.e. the customer calling waiting in the Queue, is hungup on. 


I believe the problem is because the Read section of the dial plan will 
return a -1 when the operator being called hangs up on it. 

Has anyone else spotted this ? Anyone Solved the problem ? 

[macro-screen] 
exten=>s,1,Wait(.25) 
exten=>s,2,Read(ACCEPT|screen-callee-options|1) 
exten=>s,3,Gotoif($[${ACCEPT} = 1] ?50) 
exten=>s,4,Gotoif($[${ACCEPT} = 2] ?30) 
exten=>s,5,Gotoif($[${ACCEPT} = 3] ?40) 
exten=>s,6,Gotoif($[${ACCEPT} = 4] ?30:30) 
exten=>s,30,Set(MACRO_RESULT=CONTINUE) 
exten=>s,40,Read(TEXTEN|custom/screen-exten|) 
exten=>s,41,Gotoif($[${LEN(${TEXTEN})} = 3]?42:45) 
exten=>s,42,Set(MACRO_RESULT=GOTO:from-internal^${TEXTEN}^1) 
exten=>s,45,Gotoif($[${TEXTEN} = 0] ?46:4) 
exten=>s,46,Set(MACRO_RESULT=CONTINUE) 
exten=>s,50,Playback(after-the-tone) 
exten=>s,51,Playback(connected) 
exten=>s,52,Playback(beep) 

Here is the console log for the even, 



    -- SIP/cosip-peer-09bfd798 answered Zap/25-1 
    -- Zap/1-1 answered Local/84013647@acd-outgoing-ddce,2 
    -- Executing Wait("Zap/1-1", ".25") in new stack 
    -- Executing Read("Zap/1-1",
"ACCEPT|custom/this-is-helpdesk|1") in
new stack 
    -- Accepting a maximum of 1 digits. 
    -- Playing 'custom/this-is-helpdesk' (language 'en') 
    -- Hungup 'Zap/25-1' 
Destroying call '26afc28c2c0e95fb62fc205065fbd118@167.3.35.25' 
    -- Channel 0/1, span 1 got hangup request 
    -- User disconnected 
Jan 24 15:13:12 WARNING[31943]: res_features.c:1384 ast_bridge_call: 
Bridge failed on channels Local/84013647@acd-outgoing-ddce,2 and Zap/1-1 
    -- Hungup 'Zap/1-1' 
    -- Agent/100 answered Zap/26-1 
    -- Stopped music on hold on Zap/26-1 
    -- Hungup 'Zap/26-1' 

Thanks, 
Diarmaid.
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