VOIP on Cisco 1841 router 3

[Dfig]

We have a remote location that wants to utilize IP phones on their network. Right now they have an 1841 router and a 24 port 2960 switch with about 15 users and a BCM 50 phone system utilizing analog lines. I am trying to figure out what kind of config changes I have to make on my router and switch to make this work being that I am not that familiar with VOIP. Should I put my PCs and IP Phones on different Vlans? Do I need to configure a different DHCP scope for each. I guess I need to configure Qos to give voice a higher priority than data. Any direction would be greatly appreciated.

 

[DallasBPF]

you will need;

VLAN for voice
VLAN for data
PoE Switch or Power Cubes to power the phones
FXO card for the analog lines to come into the router (4 lines per card max)
PVDM for DSP's
will they be going back to a central site or stand alone?
if stand alone you will need licensing for CallManager Express (CME).

Probably want to use the UnityExpress that is inserted into the router if it will be a stand alone system and using CME

Don't think I missed anything... Oh do you have any fax/modems coming off the current system using analog cards? if so you will need a FXS card.


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Dallas, Texas
Telecommunications Tech
CCVP, CCNA, Net+

CCNP in the works

 

[VinceWhirlwind]

You'll need to configure the connection between the 2960 and 1841 as a trunk, carrying both your VLANs to the router, where the default GW address for both will be.
Also you'll need an IP Helper there to forward the Phone DHCP requests to the existing DHCP server where you will create a new scope.

Just use autoQoS on the switch - depending on what kind of phones, you can Trust Voice or Trust DSCP - it's your WAN link that is the bottleneck, so it's on the 1841 where QoS will be vital to reserve bandwidth for the voice traffic.

 

[tanderson3733]

The 1841's AutoQoS is sufficient to run VoIP, many of our customers use them for Avaya VoIP systems and pass the Avaya required network assessment and report toll-quality voice. We use Trust DSCP.

 

[Dfig]

All the traffic from the remote sites come through the main location through VPN tunnels running Ipsec because of web filtering policies, email access, home directories and network shares. We use a Cisco 2801 router for the VPN Tunnels.