JFYI

http://www.voip-info.org/wiki/view/Cisco+7905%252F7912+IP+Phones

Re: 7905 does not start
by Tony on Monday 17 of July, 2006 [22:56:06]
This one is for Razametal or anyone else who's having the red and green steady LED's and no display on a 7905/12:

This is usually caused by a part-blown firmware upgrade which failed part way through.

The phone itself appears useless, but it is actually locked in a startup loop, and as Raza correctly identified it's requesting a DHCP
address.

In order to solve the issue a bit of work is necessary:

Firstly a DHCP server is required, and a TFTP server.

Setup option 150 in the DHCP scope to point to the IP address of the TFTP server (the phone is looking for a TFTP server address via \
DHCP option 150 - I won't go into details about how to do this as there's so many different DHCP servers around, but if you're not
sure, google it).

Make sure the TFTP server is running, and check your DHCP server logs to ensure the phone is requesting, and receiving a DHCP address.

Personally, I prefer to use Solarwinds' free TFTP server (I'm a windows user) as it has a real-time log window which gives plenty of
information about what the phone is actually requestin if you do use this version, ensure you've set it to both transmit and receive
files, as by default it will only receive).

Now for what was a bit odd for me - my failed firmware was the version 8.0 SIP firmware, and the phone was apparently looking for a file
called CP7912080000SIP060111A.zup <-- Notice the ZUP not ZIP extension! Hmm...I only had a CP7912080000SIP060111A.sbin in my tftp folder
and I could find no info on a ZUP file.

Out of sheer desperation I changed the extension of the .SBIN to .ZUP and the TFTP server sent it down to the phone and hey presto it
came back to life!!

Sweet.

I hope this helps others - It kept me up to 1.30 am trying to work out what was wrong (I know - sad geek!).

Cheers

Tony