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reg:cisco 2821 router help

2821 router support

Dear sir,

Praposed connectivity for voice between head quaters IP phones to remote branch analog phones is as for the attached network diagram.Cisco 2821 routiters with 12.2 IOS are interconnected using leased line(v.35) between HQ TO REMOTE BRANCH .At remote branch analog phones are connected on FXS ports .At HQ end IPPBX with required number of user liseces for IPPHONES is connected to the router through a ethernet switch.Is the network setup given in the diagram is correct for the desired connectivity between HQ ip phones to BRANCH analog phone.The IPPBX is configured  for SIP.What should be the configuration requirement at router for the abive connectivity to work with IPPBX in SIP mode .As well as FXS to PBX.

Plz give me some examples

Thanks&Regards

srinivas

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