We're using a couple of Cisco 7960's with the Session Initiation Protocol (SIP) firmware installed and having good results with either a Cisco 806 router or a PIX-501 firewall with SIP (call setup) proxy services provided by Vonage.
Drop me an email (or give me a call so that you can judge the voice quality for yourself) and I'll be happy to get you an invitation for a free month trial.
Or you could get an addtional IP address form your Cable/DSL provider and hard code your alternate TFTP server into the phone and it works great. Or you could hard code IP, DNS , DGW, and Mask for a static setup. Beware some ISP's block TFTP and FTP ports because of security. So far all of the people I know at my company including myself have had no problems with Time Warner Road Runner or Bell South DSL. Do not go out and buy all of those routers and vpn boxes they are not needed just the modem your provider gives you.
I am trying to do this without a VPN and I can't get it to work. My callmanger is behind a firewall. I opened a port to allow the phone to connect. The problem is that the TFTP server sends the phone the internal ip of the callmanager. How can I override this to get it to work. The phone won't let me manually configure the Callmanager. Your help would be greatly appreciated.Thanks.
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The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...