Hi All ,
I am experiencing problem while upgrading Cisco IP phone model 7911 in my VoIP setup as my Cisco CM server is using firmware version ‘SCCP11.8-3-4SR1S’ for these phones. Whereas new 7911 IP phones coming from Cisco as RMA these days are having latest firmware version ‘SCCP11.9.2(1)’. While resetting the phones to factory defaults they are getting hanged during upgradation and giving error ‘ term11.default’. As per my research, i cannot upgrade or downgrade phone firmware from sccp11.8-3-4 to sccp11.9.2 and vice versa directly.
So i read the release notes of 9.2.1and there I found, i have to upgrade phone first in 8.5.2 base release and then I can go any version.
But when I am upgrading my phone into base release 8.5.2, sometime my phone prompt me ''ERROR'' on display and boot from its previous ifirmware and sometime it prompt ''UNPROVISIONED'' on the display and phone get stuck there.
My CUCM version is -6.1.2.1000
IP PHONE FIRMWARE version -SCCP11.8-3-4SR1S(existing)
NEW load version -SCCP11.8.5.2
So request to all expert please suggest me to fix my issue.
regards
amit tanwar
