asterisk users - Oct 2005 - calls not ringing

I have a very odd problem. Normally incoming calls enter my dialplan
and person chooses an extension and I see this below:

    -- Executing Dial("Zap/1-1", "SIP/102|20|") in new stack
    -- Called 102
    -- SIP/102-XXX ringing

For this installation I am NOT seeing the RING!

    -- Executing Dial("Zap/1-1", "SIP/102|20|") in new stack
    -- Called 102

I can pick up any extension and call another extension and it rings no 
problem.
However calls coming in from outside on an TDM04B and doing a 
Dial(SIP/100,20)
the extension is not ringing!

2 seconds later I can pickup another extension 101 and call 100 and it 
rings fine.

This is a snippit of my dialplan for incoming calls on line 1 of the 
TDM04B.


DIAL_TIMEOUT=20
OPERATOR=100
[default_forepoint]
exten => s,1,Wait,1                                     ; Wait before 
speaking
exten => s,2,Answer                                     ; Answer the line
exten => s,3,DigitTimeout,3                             ; Set Digit 
Timeout to 3 seconds
exten => s,4,ResponseTimeout,20                         ; Set Response 
Timeout to 20 seconds
exten => s,5,Set(CALLERID(name)="FP")
exten => s,6,GotoIf($[${SMVOICE_ANNOUNCE_CALLER} = 
1]?6:default_forepoint,s,8)
exten => s,7,Noop("nothing")
exten => 
s,8,gotoiftime(9:00-18:00|mon-fri|*|*?default_forepoint,ring_operator,1)
exten => s,9,background(SM_FOREPOINT)
exten => s,10,SetVar(SMVOICE_CONTEXT_EXTEN=${OPERATOR})
exten => s,11,Goto(default_forepoint,operator,1)

exten => ring_operator,1,Dial(SIP/${OPERATOR},${DIAL_TIMEOUT})
exten => ring_operator,2,Goto(default_forepoint,s,9)


Any idea why?

THanks,

Jerry