hi,can anyone help me on how to configure FXO port on 2820 router and FXS port on 2810.What are the things i need to configure to make a voip network that connect to PSTN network and PBX?

hello,i need help regarding configuring nat in cisco router.my router is connected to ISP and the ISP give a dynamic IP.the problem is how i use nat if the global inside is dynamic?because ip nat pool command need a fix IP address right?so how i tran...