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Using Cisco hardphone (7960) over site-2-site vpn with CCM

Posted on 2004-08-01
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Last Modified: 2008-01-09
i currently have three locations in which operations run out of.  In the newest location we have just finished deploying a cisco voip system.  Call manager is located in this building.  The other two locations are currently connected via a site to site vpn on the WAN side.  All traffic is route accordingly between the three networks and from a data standpoint the LANs communicate perfectly.  Obviously just plugging in the 7960 at one of the other two locations is not going work (I wouldn't think).  Is there a way to get something like this to work?  Would CCM need to be administered in a way to broadcast itself to not only the local IP range but also over the VPN connection?  

Thanks, all help and comments are realy appreciated.
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Question by:logangsta
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rwotherspoon earned 300 total points
ID: 11706869
First remember the CCM does not 'broadcast itself' to any IP telephony device .... rather, the phones  seek configuration parameters from the CCM.  However, the forst step is to make sure the phones can see the CCM.  If setup properly, the site with the new AVVID system should have a Vlan setup for voice which you CCM is plugged into.  Esssentially, a phone at the remote locations when booted, looks for a DHCP server from which it is passed Option 150 (TFTP server).  Once it has an IP address, it will look for the TFTP server address provided by the DHCP server in option 150.  IF it can see the TFTP server (CCM) it will download a confgiuration file (.cnf) and attempt to register with the CCM.  If the phone is already entered into the device list of the CCM, it will register.  If not, and the CCM is setup to auto-register unknown phones (a bad security practice) it will also register.

There are two key things that must be in place to make this happen:

1. The remote LAN switchports must be configured foir the Voice vlan.
2. If you plan to plug in PCs behind the phones, the same remote LAN switchports must also be configured as trunks with the data VLAN also specified.

Assumptions:
1. The voice VLan has been properly setup on the local LAN.
2. QoS is setup properly on the ports associated with the Voice vlan (local and remote)
3. The VPN connections between the sites are properly setup
3. You will also setup QoS on the VPN link and the switches (remote) to assure best quality.
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by:rwotherspoon
ID: 11941642
Have you had a chance to try my suggestions or make use of the information I provided??
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by:logangsta
ID: 12026112
I did try it, however failed to get it to work.  I think our setup has a few more considerations than I initially stated.  Your response however seems very in-depth and technically correct.
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by:rwotherspoon
ID: 12026280
If you can provide additional configuration parameters I would be glad to walk you through making this work... it is what I do for a living.
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