integration of old PSTN lines with cisco Ip phone

[amolkhatavkar]

I have CCM 4.1 , 7970 IP phones and one Cisco 4506,one EPBX with analog phones in my network. I want to integrate these so that internally anyone can give a call from analog to digital and vice versa.

My concern is what extra device is required for this integration? or this setup is ok ? (any voice gateway ?)

Thanks.

[paolo bevilacqua]

You have to check which interfaces are available on the PBX, in order of preference:

digital E1

digital ISDN BRI

analog E&M

analog FX and FXO (you need both)