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To start off with I have created a set of files that will help you get started, you can download the set here (download).Inside the zip file are the following files: Let’s assume your phone’s mac address is 0023331BEA0A, we will need a file named SEP0023331BEA0xml for the phone to configure itself.Typical ones to ignore are the following: Those are actually “normal”, what you do not want to see is “Unable to Parse file”, that will tell you that it did not like something in your config file.This can be something like using a host name when it wants an IP address.This is done by adding the following commands to the router’s configuration: We also need to ensure there is a valid DHCP server running with option 150 set to CME’s IP address. When the IP phone boots up, it will look for a DHCP server that will provide it with an IP address, but also expect to find DHCP option 150 which designates the CME the phone should try to register with: The above configuration excludes IP address ranges 10.0.0.1 to 10.0.0.15 from being handed out by the DHCP server.It also creates a DHCP scope named and configures various self-explanatory parameters including the critical DHCP option 150, which represents the CME the IP phone should try to register to.The final step involves configuring CME to use the new firmware and instruct IP phones to download it.This is done by issuing the following commands under the telephony-service section of CME: The load command is followed by the phone type and associated firmware (.load) file.
If the Cisco Unified IP phone is currently running firmware 6.0(2) to 7.0(2) and you want to upgrade to 8.x(x), you can do so directly. To download Cisco IP Phone firmware a valid Cisco CCO account is required.
Cisco IP phone SCCP firmware files version 9.2., 7965 & 7975 IP phones (latest version at the time of writing this article) are available at our Cisco IP Phone & ATA Firmware Download section. When performing the factory reset procedure we are about to describe it is important to keep in mind that the IP phone will lose all configuration files and phone application.
This means that it is necessary to have Call Manager or Call Manager Express setup so that the IP phone will be able to receive the new information (phone application and configuration) after the reset procedure is complete, because it is likely the IP phone will not be usable until this information is loaded.
While I can tell you that Cisco recommends using SIP firmware 8.3.2 SR1S, I cannot provide the firmware files because of their licensing agreements.
Assuming you can get the correct firmware copied to your tftp server, and your DHCP server is serving out Option 66 to tell the phones where to look for its config files (yes, these are mandatory requirements), then we can get into how to actually configure the phones themselves.