how do you config cisco 1800 router

Yesterday I discovered this question about cisco 1800 routers,and then idiscovered the answer for,i think it's useful,so i put published it here.

There are questions and answers Below.

The question:

Hi everyone

I am wondering if anyone can help with the issue below.

Iam trying to get a IP telephone system to function over a VPN to connect two offices together. The VPN is currently stable transmitting other informtion.
To do this I need to be able to connect the Avaya IP406 Office to an cisco 1800 series router ISR router.

I have worked out how to physically do this in terms of connecting the required port but I am not sure what else I need to get to get this to work. I would be very grateful if someone could instruct me on how in principle this would work.

We hope to end up with a scenario where two the avaya systems are linked using the VPN and that if the required extension is dialled in one office it will call the required phone in the other office.

And the answer to it:
You could use a roll-over cable to connect to the console port of the cisco router and login to the router through Hyper Terminal.I think all cisco 1800 series routers use "cisco" as username and password by default

If u'r not comfortable with cisco commands I would recommend using SDM (Security Device Manager) software to configure the router. You can download the CISCO SDM from the cisco web site, it's free of charge.

Install the SDM in u'r windows pc and connect to the router. With this method you could configure the router in a GUI environment.

The cisco 1800 Series fixed-configuration routers are designed for secured broadband access, Metro Ethernet, and wireless connectivity. They also help businesses reduce costs by enabling deployment of a single device to provide multiple services typically performed by separate devices.

The Cisco 1811 Integrated Services Router provides the following support:

Secure broadband access with concurrent services for branch and small offices
Integrated ISDN Basic Rate Interface (BRI), analog modem, or Ethernet backup port for redundant WAN links and load balancing
LAN Switching with optional inline POE
Secure wireless LAN for simultaneous 802.11a and 802.11b/g operation with use of multiple antennas
Advanced security including:
Stateful Inspection Firewall
IP Security (IPSec) VPNs (Triple Data Encryption Standard [3DES] or
Advanced Encryption Standard [AES])
Dynamic Multipoint VPN (DMVPN) and Easy VPN
Intrusion Prevention System (IPS)
Antivirus support through Network Admission Control (NAC) and enforcement of secure access policies