Cisco IP Phone 7941G that is using firmware SCCP 41.8-3-2S cannot resolve the Cisco CallManager host name and therefore does not provide a directory number
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Your phone is trying to connect to a TFTP server address to download a firmware and/or config file update. You need to figure out what IP address it is trying to connect to (You may have to use wireshark or another packet sniffer to determine this).
Once you know the IP it is trying to connect to, you'll need to set up a small network with a TFTP server running on that same address, and feed the phone a firmware update and/or config file. It will likely not fully boot unless it gets a firmware update.
If there are lines through your line appearances than your phone is likely not properly registered with your Callmanager or SIP registrar, you need to configure your phone properly so it registers and associates with an extension on your PBX or hosted service.
I know it may be late (definitely late), but have you defined in the CallManager, that your phone has a "side card"? If CallManager does not know that it has to push an additional firmware to a particular phone, it will not work.
These phones can take their power from a Power over Ethernet switch, where all you need to do is plug the phone in to the switch and it gets its power from there.
You can also get power cubes for these phones, but they do not come with the phone as standard, as most people like the convenience of having the power coming from the switch, and not needing to use up a further power socket in the floor/wall.
Here's a great little document from Cisco directly, called "Converting a Cisco 7940/7960 CallManager Phone to a SIP Phone and the Reverse Process" Easy to do, just follow the step-by-step directions. http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a0080094584.shtml
You will need to modify the template assigned to that particular phone. Depending on the service you are using (CallManager onsite or hosted VoIP, or other options), you may or may not actually have access to make these changes. See also Cisco's guide located at http://www.ciscosystems.am/en/US/docs/voice_ip_comm/cuipph/7960g_7940g/7_0/sip/english/administration/guide/7960usrS.pdf
If the 7941g is the cisco cp-7941g ip phone then no you can not since the ip phone only has ethernet connections and the airap1131agak has only wireless connections on it as it is a wireless access point, so you will need a wireless router or something similar to get the wireless to ethernet cable.
What CCM ver you on?
Have you tried another working phone on this port?
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