My Cisco IP Phones (SCCP protocol) have stopped requesting the SEP<mac>.cnf.xml configuration using the TFTP protocol and started using HTTP. I can not figure out why this recently started happening. I have attached a wireshark trace of the SEP file exchange and SCCP registration if that can help answer why this started happening. My cluster / CUCM is running in nonsecure mode so I do not understand why the files are now appended with .sgn.
Thank you for the quick response. I am running CUCM 11.5 (System version 22.214.171.12402-2) in my lab for development purposes. IP blue Software is a development partner of Cisco. We are doing registration and failover testing for a joint customer of ours. (Cisco & IP blue) A few weeks ago when I was testing and comparing to a IP Phone TFTP was the protocol used for negotiation between the 7965 and CUCM. I just checked the firmware image on the phone *SCCP45.9-4-2SR-1S*. I haven't upgraded the device pack(s) recently on CUCM.
My understanding was the SCCP phones used TFTP by default and SIP Phones used HTTP. I'm trying to figure out why / how this changed in my lab setup and if we should integrate support for HTTP GET request first and then fallback on TFTP if HTTP is unreachable.
I've been looking on Cisco's website for updated documentation around this but must not be looking in the correct spot.