Hello to the list again.
I have my ATA behind NAT connecting to * then calls are fwd to Cisco 2600. 
Calls are completing, I just cannot figure out why I don't hear any ALERTING
signals from the 2600 (ringback, fast busy, SIT, etc).  Audio works fine though.
I'm using G711ulaw.  And I don't want ATA or * to provide the false
ringback so I took out ('r') in my Dial command.  Existing command is as
follows:
exten=>_.,1,Dial(SIP/${EXTEN},20,tH)
I hope somebody out there could help me on this.  Thanks.
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