I have a problem for product KX-TEA308 err Cannot

Yes, the Panasonic KX-T7667 phone and the Panasonic KX-TES824 PBX are compatible.
The KX-TES824 should be able to accommodate different handsets because it is made to work with a variety of Panasonic phones, including the KX-T7667 model.

You must connect the KX-T7667 phone to an available extension port on the PBX and configure it with the proper parameters using the PBX programming software or a web interface in order to add the phone to your current PBX system.

It's vital to keep in mind that the KX-T7667 is a proprietary phone made just for Panasonic PBX systems and might not work with other phone systems or third-party hardware.

https://youtu.be/UnEQYwoj2DU

Here is the link.

Just a matter of reprogramming.

Pt Programming - Panasonic KX-TEM824 Features Manual

https://www.manualslib.com > ... > Features manual
Panasonic KX-TEM824 Manual Online: Pt Programming. Description A proprietary telephone (PT) can be used to customise the settings of the PBX or of an ...

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  Panasonic KX-TEM824 User Manual - ManualsLib

  https://www.manualslib.com > ... > PBX > KX-TEM824
  View and Download Panasonic KX-TEM824 user manual online. Advanced Hybrid System. KX-TEM824 pbx pdf manual download. Also for: Kx-tes824.

KX-TES824 Model KX-TEM824 Installation Manual

https://business.panasonic.sg > psd > 2020/06/08
PDF
Jun 8, 2020 - Explains how to install and use KX-TE Maintenance Console, a PC-based programming utility. Section 4 Troubleshooting. Provides information on ...
98 pages

A bad connection by your Telco outside, on poles, or underground vaults or a bad connection in the box.

Panasonic Hybrid IP-PBX KX-TDA 50 User Manual.pdf

https://www.pbxmechanic.com > manuals > Panasonic ...
The Panasonic KX-TDA50 has been powering small office communications for now. It's a hybrid IP-PBX System and capable of supporting 48 digital KX-T7600 series ...

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  Panasonic Hybrid IP-PBX KX-TDA 50 Installation Manual.pdf

  https://www.pbxmechanic.com > manuals > Panasonic ...
  The Panasonic KX-TDA50 has been powering small office communications for now. It's a hybrid IP-PBX System and capable of supporting 48 digital KX-T7600 series ...

It depends what telephone system the KX-T7730 is connected to. You should have a Panasonic box that says 'KX-TA624', 'KX-TEA308, 'KX-TES824' or similar somewhere.
Depending which Telephone System you have, it may just need programming or it may need an additional card (circuit board) installing. Panasonic KX TEA TES Telephone Systems Tiny Telecom

You need to set the time on the PBX the phone is connected to. Please refer to the documentation for the PBX.

If you require further assistance then please add a comment to this question and specify the PBX.

You have this posted in the wrong product category. Please select another category appropriate to the problem.

It initializes in 808. Try looking in the installation manual for the complete programming references.

Carl

This is a PBX system, correct? If so, the fastest way would be through the PBX control computer. If you have a Panasonic TAW series PBX, I really like the AbleComm websites, search for your model PBX there.