Andrew, Here is one documentation from Cisco itself: http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09 186a0080094584.shtml
This one is in a step by step guide http://www.3cx.com/support/convert-cisco.html Bear in mind, the key to getting these to upgrade properly is a good tftp server which is compatible with the finicky Cisco ip phones. Good Luck Elliott > -----Original Message----- > From: STOCK Andrew -TSDC [mailto:[email protected]] > Sent: Thursday, April 02, 2009 11:38 AM > To: [email protected] > Subject: [on-asterisk] Converting Cisco 7940's to work with Trixbox... > > I know a lot has been written in other message boards and > other groups about how to convert a phone from Cisco's > proprietary software to SIP. > I have various firmware levels in SIP that I have tried to > upgrade the firmware on these 5 - 7940 units I have. I have > 3 that work flawlessly. > > > > Here is what I have > > * 3 - 7940's that always give me "Universal Invalid > Application > Protocol" errors each time they try to boot. > > * 1 - 7940 that hangs on "Configuring VLAN" > > * 1 - 7940 that completes the boot cycle then starts rebooting > again, it just cycles through the reboot process. > > > > Has anyone come up with a "simple" way of upgrading these > units work with SIP. I have firmware versions: 5.1, 6.3, > 7.5, 8.8 and 8.10. > > > > I always find it easier to follow a step by step guide when > trying to complete this kind of thing, has anyone put > together such a beast? If so are they willing to share? I > would really appreciate it if someone could help me with the > firmware conversion problem. > > > > Thanks. > > > > Andrew R. Stock / Capgemini / Toronto > > Senior Telecom Analyst / New Horizon System Solutions > Office: +1 416 592-2198 / Mobile: +1 416 346-2198 / > www.ca.capgemini.com <http://www.ca.capgemini.com/> > Fax: +1 416 592-4888 > > 700 University Avenue, H2C27, > > Toronto, Ontario > > CANADA > > M5G 1X6 > Email: [email protected] > > Join the Collaborative Business Experience > > THE RIGHT SHORE IS RIGHT HERE ! > > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
