![]() The problem is the option for TFTP server, option 150, is not built a default option on any DHCP servers that I’ve ever worked with. So how does the phone know where to find this TFTP server? That information is passed to the device as an option when it receives its IP address from the DHCP server, much in the same way it learns the default gateway and DNS servers. All of this is fed to the device via the transfer of a configuration file from the TFTP server integrated into Cisco Call Manager. With Cisco’s IP phone system the end phone devices are dumb devices, they store no configuration at all and have to be fed up to date firmware revisions. ![]() Other Linksys/Cisco SPA telephones can have different administration interfaces, however, option Profile Rule is available in all telephones.One of the bigger systems that I find myself supporting in my infrastructure is our Unified Communications system from Cisco Systems. In the web browser, type the following address: Ĭonfiguring the Linksys/Cisco SPA phone Profile rules for other Linksys/Cisco SPA telephones
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