Conference hardware

Hi guys, I'm having some issue here.

 

I'm setting up my router C (Branch 2) and I get it:

I could set up the command "conference hardware" under telephony-service and it works well with my 7965 but when I try to do the same under voice register global this command doesn't appear to me and because that I cannot set up my 9971 to initiate conference.

 

My router is 2811 can it be because of I am using a first generation of routers? if yes Why do I need the second one? CME 9?

 

Thanks

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