What happens to Panasonic KX-TEB308 PBX PTs during a power failure?
- Mmarvin04Sep 1, 2025
During a power failure with your Panasonic PBX, only single line telephones (SLTs) can be used. Disconnect the PT and connect an SLT.

What happens to Panasonic KX-TEB308 PBX PTs during a power failure?
During a power failure with your Panasonic PBX, only single line telephones (SLTs) can be used. Disconnect the PT and connect an SLT.
Why are Panasonic PBX PTs not working but SLTs are?
If proprietary telephones (PTs) connected to extension jacks on your Panasonic PBX aren't working, but single line telephones (SLTs) are, the H and L pins of the extension jacks may have shorted. Turn the power switch to the 'OFF' position, fix the shorted part, and then turn the power switch back to the 'ON' position.
What to do if no sound is heard on Panasonic KX-TEB308 speakerphone?
If you can't hear sound when using the speakerphone on an analogue proprietary telephone connected to your Panasonic PBX, check the HANDSET/HEADSET selector. If it's set to the 'HEADSET' position, switch it to the 'HANDSET' position when you're not using a headset.
Why is there noise through the external pager on my Panasonic KX-TEB308 PBX?
If you hear noise through the external pager or loudspeaker connected to your Panasonic PBX, and you're using an amplifier, the noise might be introduced through the cable connecting the PBX and the amplifier or loudspeaker. Try using a shielded cable to connect the PBX and the amplifier or loudspeaker. A shorter cable can also reduce noise.
How to fix distorted audio (Music on Hold) on Panasonic KX-TEB308 PBX?
If the audio, such as Music on Hold or Background Music, is distorted on your Panasonic PBX, the audio level from the output of the audio source might be too high. Decrease the output level of the external audio source using its volume control.
Why is my Panasonic KX-TEB308 proprietary telephone not ringing?
If your Panasonic PBX proprietary telephone (PT) isn't ringing, the ringer volume might be set to off. Adjust the ringer volume to either 'HIGH' or 'LOW'.
What to do if outside calls cannot be made with a Panasonic KX-TEB308 PT?
If you can't make outside calls with a proprietary telephone (PT) on your Panasonic PBX, a flexible button on the PT may not be programmed to select an outside (CO) line. Program the CO buttons to resolve this.
Why is speed dialling not working on my Panasonic KX-TEB308?
If speed dialling or one-touch dialling isn't working on your Panasonic PBX, the programming might be incorrect. Make sure you've stored the outside (CO) line access number (e.g., 9, 0, or 81-83) at the beginning of the telephone number.
| Caller ID Compatibility | Yes |
|---|---|
| Uniform Call Distribution (UCD) | Yes |
| PC Programming | Yes |
| Emergency Call Forwarding | Yes |
| Voicemail | Optional |
| Conference | Yes |
| Power Failure Transfer | Yes |
| Capacity | 3 CO lines and 8 extensions |
| Power Supply | AC 220-240 V, 50/60 Hz |
| Direct Inward System Access (DISA) | Yes |
| Built-in Voice Message (BV) | Not available |
Explains compatible telephones, feature access, and basic operations.
Details various methods for initiating calls, including internal and external.
Covers answering incoming calls and managing call waiting.
Explains call handling features like transfer, hold, and conference calls.
Describes features for managing calls when away from the desk.
Details how to make and receive paging announcements.
Covers personalizing settings like alarms and call handling.
Explains integration with external devices like doorphones and PBXs.
Focuses on features specific to display telephones, like call logs.
Details features controllable by operators or managers.
Guides users on personalizing phone settings and features.
Explains how to print and clear call log information.
Covers system-level configuration and programming of the PBX.
Provides solutions for common problems encountered with the system.
Lists feature numbers for accessing PBX functions.
Explains different tones used by the telephone system.











