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FXO card and T1 CAS card

Does anybody knows that FXO card or T1 CAS supports hairpin?Fox example, an IP phone is set forward all call to his cell phone, if I make a call from pstn to this ip phone through FXO or T1 CAS, will the router forward the call to his cell phone? Assuming there are couple FXO ports on the router or couple channels on the T1 CAS card. It's sure no problem to achieve this on T1 PRI. I am just wondering how about on FXO or T1 CAS. Thanks

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Re: FXO card and T1 CAS card

It works fine, the only gotcha is if you use analogue FXO to FXO , then you get no disconnect supervision from the network, and the inwards and outwards lines will stay up even after the A and B parties have hung up. Refer here for more information -

http://www.cisco.com/warp/public/788/signalling/fxo_disconnect.html

T1 CAS using E&M wink/immediate works fine.

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