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You can most definitely place a call from a CAS trunk to a voice user built to an FXS port. To the best of my knowledge you can't use an FXS port as a bridge-tap to monitor a call between a CAS trunk and another endpoint.
You might be able to use the hotline feature to nail a call up.
It sounds like a channel bank may be your best solution here.
I'm using a Adtran TA750 now.In DPO mode I was trying to replace the 750 with the TA900 function since we do not use the Analog side of the TA900. I'll give the hotline a try
For simple T1/CAS to FXS (Analog to digital conversion/Dedicated Maps) you can use our Total Access 850 Modular Channel Bank/IAD, or the Total Access 600 Series Fixed-Port Channel-Banks/IAD's. However, if you're looking for intelligent call switching (or routing T1/CAS to FXS via a Dial Plan), you'd want to look at our ATLAS 550 product.
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