I offer firmware for Cisco 6921 SCCP phones in the CUCM 8.5 SCCP69xx.9-3-3-2-SR1 configured in device defaults. CUCM System version: 18.104.22.16800-21.
Only seven Cisco 6921 phones, only in one site of my company stopped working suddenly. There were registered but without dial tone and you couldn't dial. I have more than two hundred Cisco 6921 SCCP phones configured.
I performed a workaround to resolve this issue configuring SCCP69xx.9-0-3-0 in phone load name, restarting Cisco TFTP service and then restarting the phones but I can see in one phone that:
App Load ID
Boot Load ID
I don't understand why app load id after configuring SCCP69xx.9-0-3-0 is different from the phone firmware configured.
I'd like to know the main causes of this firmware problems and practical knowledge working with firmwares in Cisco phones.
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