Hi Captin,
Just to add a note to the good tips from my friend Gonz (+5 points for your good help Gonz:)
Firmware Files via the new Software Downloads;
Voice and Unified Communications > Cisco Unified IP Phone 7945G > Skinny Client Control Protocol (SCCP) Software > 8.4(1)_SR1 > cmterm-7945_7965-sccp.8-4-1SR1.cop.sgn
The ReadMe notes and install instructions are available once you click on the Download.
From this page (that won't paste properly I'm sure :)
http://tools.cisco.com/support/downloads/go/ImageList.x?relVer=8.4(1)_SR1&mdfid=281346594&sftType=Skinny+Client+Control+Protocol+%28SCCP%29+Software&optPlat=&nodecount=2&edesignator=null&modelName=Cisco+Unified+IP+Phone+7945G&treeMdfId=278875240&treeName=Voice+and+Unified+Communications&modifmdfid=null&imname=&hybrid=Y&imst=N&lr=Y
This is done via OS Admin>Software Upgrades
Software Upgrades
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You can use the Software Upgrades options to perform the following types of installations and upgrades:
•Install/Upgrade-Use this option to upgrade the application software, install Cisco Unified Communications Manager Locale Installers and dial plans, and upload and install device packs, phone firmware loads, and other COP files.
•TFTP File Management-Use this option to upload various device files for use by the phones to the TFTP server. The TFTP server files that you can upload include custom phone rings, callback tones, and phone backgrounds.
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/cucos/6_0_1/cucos/iptpch7.html
When using Cisco Unified CallManager Release 5.0 or later
For Cisco Unified CallManager 5.0, you must do all software installations and upgrades by using the Software Upgrades menu options. The system can upload and process only software that Cisco Systems approved. You cannot install or use third-party or Windows-based software applications that you may have been using with a previous version of Cisco Unified CallManager with Cisco Unified CallManager 5.0.
Using your web browser, login to the Cisco IPT Platform Administration web page
Under the Software Upgrades menu, select Install/Upgrade.
Fill in the appropriate values in the Software Location section for the file you downloaded above, and click Next.
In the Available Software drop-down box, select the file you downloaded above, and click Next.
After validating the MD5 has the correct value, click Next.
In the Warning box, verify you have selected the correct firmware, then click Install.
Check that you received a Success message.
Hope this helps!
Rob
