[cisco-voip] Odd phone Firmware upgrade issue - 8811 at firmware 10.3.1-20 won't upgrade on CUCM 12.0 but will on 10.5

[Brian V]

Odd phone Firmware upgrade issue - 8811 at firmware 10.3.1-20 won't upgrade
on CUCM 12.0 but will on 10.5



8811 shipped with 10.3.1.-20 firmware, CUCM 12 and CUCM 10.5 both have
default load for 8811 phones set to 12-1-1SR1-4.



Customer acquired some new 8811 phones with super old firmware. Unboxed
them and attached to the network where other IP phones (8851,8861) are up
and registered to CUCM 12.0.1.22900-11.  The 8811 would not upgrade code.
It had an error in the phone log about the default xml config file.  Tried
resetting security settings, full factory reset, etc..  Nothing worked.  I
was suspecting the old "2-hop upgrade" might be needed, but that didn’t
work either.



I then erased the phone again and connected it to a CUCM 10.5.2 SU2 system
with the latest device pack.  The default phone load on this CUCM 10.5 was
the same as CUCM 12.0 and the 8811 phone was still at firmware 10.3.1-20.
The phone upgraded code no problem.



Once the phone was on firmware 12.1.1SR1-4, it registered fine to CUCM 12.0.



My current working theory is that CUCM 12 seems to use an EC certificate on
the HTTPS service that newer phones use to download firmware (
https://<cucm>:6972)
, and the old firmware doesn’t support it.  But if this was true, why
didn’t the 8811 phone fall back to plain-old TFTP over UDP 69.



I have a TAC case open, but not making much headway yet.



The big issue is that I have 100's more of these 8811 phones in boxes and
having to unbox each of them and temporally connecting to a CUCM 10.5 to
get firmware upgraded is not a task I'm looking forward to.



Recap:

8811 phone at firmware 10.3.1-20 firmware will directly upgrade to firmware
12-1-1SR1-4. on CUCM 10.5 but won't do the exact same thing on CUCM 12.0-SU2



Any thoughts on this issue ?



Brian Van Benschoten

Presidio
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