Unregistered Cisco phone

[ahmedhamed301187]

Dear All,

The cisco phone Unregistered without any reason it working normally and suddenly not working.

[Leo Laohoo]

[ahmedhamed301187]

I don't understand

[Leo Laohoo]

Without any useful information other than "it worked before and now it does not", it is, indeed, a "cool story".

[ahmedhamed301187]

Ok,

I have CUCM In BE6000M Device and i try solve my issue as following:

 removed the phone from CUCM and create it again ,disable the DHCP in the phone and enable it again but still unregistered.

The phone model Cisco 3905

[b.winter]

And have you checked the logs of the phone and CUCM? Have you checked the switch-port / the switch / the cable?
That's basic troubleshooting...

[b.winter]

In other words: "Why don't you start troubleshooting the problem?!" or "What troubleshooting steps have you already done?"

[ahmedhamed301187]

I already removed the phone from CUCM and create it again ,disable the DHCP in the phone and enable it again but still unregistered 

[Leo Laohoo]

If the phone is not registering, is the phone, at the very least, getting a valid IP address?

[ahmedhamed301187]

yes and it is working properly but suddenly stop working (Unregister)  

[Leo Laohoo]

You are not answering the question.  

Is the phone getting a valid IP address or not?

[ahmedhamed301187]

Yes

[Leo Laohoo]

Have you tried to factory-reset the phone? 

Did you clear the ITL?

[ahmedhamed301187]

No, Please tell me how

[Leo Laohoo]

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@ahmedhamed301187 wrote:

No, Please tell me how

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Oh, FFS!