Asterisk and Verizon Centrex

Hi, I have an Asterisk box temporarily connected to a Verizon Centrex phone line.  I have a TDM400p installed with one FXO port configured.  I have 2 questions:

1) how do i configure/utilize the call waiting feature that's already included in my centrex line that's connected to my Asterisk box?  Because currently while on a call via an outside line, any incoming calls  made to the verizon line gets a busy signal and if i connect that line back to a regular phone, the call waiting feature works.

2)  I currenty have to dial "99" and the number to make an outside call, i.e. "9917145552327" obviously that's due to the centrex feature that requires dialing 9 to get out.  Is there a syntax to enable just dial 9 once?

here's my current code for outside dialing:

[dial-trunklocal]
ignorepat => 9
exten => _99NXXXXXX,1,Dial(${TRUNK}/${EXTEN:1})
exten => _99NXXXXXX,2,Congestion

Thanks in advance!
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jetli87Asked:
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grbladesConnect With a Mentor Commented:
> when on the line is in use, any incoming call gets a busy tone.  It's consistent every time.

I meant what happens when you have an analogue phone attached.

You could use the following which will enable you to use an 8 prefix.
exten => _8NXXXXXX,1,Dial(${TRUNK}/9${EXTEN:1})
exten => _8NXXXXXX,2,Congestion
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grbladesCommented:
1) Not sure. What happens normally if you are on a call and someone calls you? Do you hear anything to tell you there is another call?

2) If you change the code to the following you will only need to dial a single 9.

[dial-trunklocal]
ignorepat => 9
exten => _9NXXXXXX,1,Dial(${TRUNK}/${EXTEN})
exten => _9NXXXXXX,2,Congestion
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jetli87Author Commented:
> 1) Not sure. What happens normally if you are on a call and someone calls you? Do you hear anything to tell you there is another call?

when on the line is in use, any incoming call gets a busy tone.  It's consistent every time.

as for the dialing out, i've tried that originally but an additional 9 must be configured to access the centrex line, or dial out.  So it's one 9 for Asterisk and another 9 for centrex.
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