Cisco 2811 SIP trunking to PBX

I am in the process of getting Qwest Integrated Access service installed. It is basically a T1 that they split between voice and internet. The device that they use to split it is a Cisco 2811 router that provides me with a couple ethernet connections and one T1 connection. I currently don't have a T1 card in my PBX as I have been using SIP trunking and would rather not spend the money needed for a quality one if I don't need to. My question is this:

Can the 2811 support SIP trunking and would it possible to connect my PBX to the Cisco 2811 router using this? I am free to make any configuration changes to the router.

From what I have read it looks like this may be possible, but I have not seen this done or spoken with anyone who has.

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Only if the 2811 has the Voice feature set. I suspect you have IP only. Post result of 'show ver'
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evotsiAuthor Commented:
From what I could tell those configurations basically showed the 2811 acting as a CallManager PBX and registering to a SIP Proxy Server on the WAN side.  I am looking for it to be the SIP Proxy Server so that my PBX can register using a SIP trunk.

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