My IP phone will not download the software from the TFTP on the CME Router.
This is the error it has now. Protocol Application Invalid
Everything was working fine before. Does any one know how I can fix this issue?
Solved! Go to Solution.
I performed a Factory reset but, did not run that debug yesterday. I will try it this evening. Have you seen this before? What did you do to fix it?
I understand. I bought these phones off Ebay and hopefully will not need any software to reload the whole phone. If I do what do you suggest? I have an AUX port on this phone. How do I interface the phone via the AUX port if I can not login to it via IP? Do I need some special type of cable? I am new to this whole voice thing. Sorry for all the questions.
You absolutely need the sccp firmware for the phones, any version will will do.
The AUX port is not used for logging in and does not help you in restoring the phones.
I got a chance to run the debug tftp events after plugging up my ip phone lastnight. I plugged up my working phone and saw the tftp download the working phone requested from the debug. I then plugged up the phone that has the Protocol Application Invalid Error and did not see were it looks for a tftp server via the debug running on the router. Is the phone broken or something? When ever I reset it to factory default after rebooting it goes to configuring ip then goes to the Protocol Application Invalid Error after a couple of minutes.
Yes I am choosing the erase config option
Option 1 is to save the current Config the on Phone
Option 2 is to erase the current Config on Phone
I always select Option 2
As far as the the debug I get no output what so ever from the router when I boot the phone with the Protocol Application Invalid Error.
Do you have DHCP with option 150 ?
Also I suggest you connect phone to a PC with TFTPD32 and wireshark for further analysis.
I'e never seen a phone that cannot be recovered being persistent enough.
Yes, I have configured my Windows DHCP server with the option 150 TFTP and even entered the IP address of the tftp server. I will do the wireshark thing tonight. Should I be using the Native data vlan or the voice VLAN when I do this? My other phone is on VLAN 1 Data Vlan and it has no problems.
I mean if I have 2 DHCP pools how does the ip phone now what pool to get the ip address from? I am confused about how the layer 3 device would know how to route everything. I understand the config above but, am missing what needs to be configured on my 3550 layer 3 switch.
When the phones initially sends CDP, the switch understand there is a phone and they agree to use a tagged voice vlan for all phone activities. No configuration is necessary beside the one I gave you before. If you want inter-vlan routing done by the switch (recomended), just configure its vlan address as default gw in dhcp.
It is recommended that you keep the dhcp server for phones on the cme router, this way you don't have any dependency to a server and can easily configure, and monitor the entire boot process of a phone in a single place.
Thanks so much Nick I think this finally makes sense to me. I guess I would have to setup subinterfaces on my router in order to run route data traffic and voice traffic right.