I've bought a CISCO 3640 - thinking i will configure call manager express on the router.
Once the router reached me, i realized (bitter truth) it doesn't have any network module.
Here is the help I need.
1) does network module depend on IOS version? Currently IOS version is 12.3 however for CME i will upgrade that to 12.4
2) I want my provider (Internet) to connect to the router (it has a public IP), so Ethernet Interface on router should do it for me?
please suggest which NM should i purchase? If i have more ethernet interface it will be good, however for CME - is there any network interface needed for CME setup. Im very new to CME & I've no hands on in setting up the network. Please help.