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SIP 3911 unregistered after firmware update

Hi to all!

Here's the issue?

I had a sip 3911 registered on my cme (v. 7.1) and ios Version 12.4(22)YB4.

I upgraded the phone firmware to 8-1-4a version.

After doing it the phone registers and unregisters constantly, according to the debugs.

The configuration on the cme has not been changed, except the "tftp-server" calls and the "load 3911" on the voice register parameter.

Could anyone give me an idea to fix it?

thank you very much

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