SCCP based Ip phones request services from their SCCP server (like CME router). What do i need firmware for ? i mean i have read cases where like 7960 is being upgraded so why is that ? what a firmware natively provides to ip phone ?
Can someone explain or direct me to what are firmwares for ? pls dont direct to upgrade procedures, i am just confused as to what are ip phones firmware ?
One more question pls, if i reset the ip phone, will it delete the firmware also ? i have heard of a default firmware, so is that default firmware always present even in the presence of newer firmware ?
Please explain them to me.
Also does any book explains the above concepts ? i think they are critical for voice newbies like me :-)
There are two different resets: normal and factory. A normal restart (power removal, Reset button in CUCM, etc) just reboots the phone and does not remove the firmware stored on its local flash. A factory reset on the other hand does. You cannot do a factory reset remotely and there are model-specific procedures for doing it. If you perform a factory reset the phone has no firmware at all, only the bootloader necessary to find the TFTP server and download firmware again. The firmware it downloads from CUCM will be the default firmware unless you have specified a different version on the device configuration page.
Default Firmware is a CUCM term, not a phone term.
Firmware is a widely used term in reference to many different types of electronic devices (printers, graphics cards, phones, etc.) and normally refers to a small piece of software that provides the most basic functions for a device.
Cisco phone firmware provides several functions:
1. Tells the phone what protocol to use (SCCP, SIP)
2. Controls the boot process including DHCP, TFTP, etc.
3. Interacts with the configuration file downloaded from the call control server in order to provide a particular DN, specific ring tones, phone features, etc.
This is certainly a broad overview and does not cover all functions of the firmware. Hope this helps.