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Try unplugging the phoen and plug a single line telephone into the port. If it doesn't work, you have your answer. The voice pair, which will use the inner pair of a 4 conductor cable needs to be working before the multi-line set will work. I'm guessing you have the data path but not the voice. The phone looks like it works, but there is no sound.
A TD system is a DIGITAL phone system and the 7730 phones are ANALOG. I don't know what X means, but I guess they're not from the US :-). Anyway, the ANALOG phones need 4 wires to work, instead of the 2 that the digital phones have. If your installer was lazy and didn't cross-connect 4 wires at the frame or put in 4 bridge clips on each jumper, then you don't have a voice path. Or, XDP is turned on and you'll have a bit of a problem.
If you have an IM and a PM for the TD system, you can find the wiring diagram and the instructions to read the XDP status. Quick answer is the first 2 of every 3 pairs will run to your phone. If you start with a digital phone in the port first, turn on XDP and plug a single line set into the XDP port, you will get dial tone (may have to dial 390 or 391 to enable/disable the XDP twinning) and that dial done will be different from the digital phone. If you don't get dial tone, your first pair wiring is missing. Fix that, turn off XDP and you 77xx series phone will now work in the port.
The KX-T7735 is a proprietary digital phone that only works when connected to a Panasonic telephone system through a 4 wire line cord. It does not need an ac power connection to operate, it gets its power through the line cord when connected to a Panasonic phone system. This phone will not work if connected directly to an outside line.
Do you plan on doing anything to help yourself? In a room somewhere, there's a Black and Blue cabinet wiht jacks on it. One of those jacks is the one that contains dial tone for line 1. You also have an interface somewhere that has line 1 and it has a modular jack to plug into (usually). You have to take a REGULAR phone, not the Panasonic digital phone, and plug into the line to determine if it's inside or outside trouble. It will probably be outside, then you report it to whoever supplies your phone lines.
If it is inside, you can always swap the plugs for lines 1 & 2 to see if you have a programming issue. This assumes you have a TDA-50 or lower or NCP phone system. If you have a TDx-100/200/600 then you need to be a little more familiar with troubleshooting.
Look at the phone. See all of those buttons? Did you expect it to work with a regular phone line when it's a DIGITAL phone? It plugs into a Panasonic digital phone system and works very well. Fortunately, you can't destroy it by plugging it into a reguar phone line, since it doesn't use that pair. Take it back to where you got it.
You can remove your telephone line from the base unit and fix it to stranded telephone unit and hear the dial tone.If it heard then some inductor or else part may be broken inside the base unit due high current surge.If the dial tone didn't heard from the other phone also check for the corroded line cord or modular box fault with the tel line.There should be 30 Volt-50Volt D.C.Voltage at your wire ends.
I hate to mention this, but is is plugged into a working line?
Early Panasonic systems look for line voltage between 24&52 volts. When that voltage falls below that threshold, it thinks the line is busy. Avaya Legend stations were horrible for plugging Panasonic systems into.
Your problem may be something as simple as a bad line cord, or as complex as being on a telco Pair Gain device. Try your sets on another known working phone line or maybe take a voltage reading of the line. You can probably figure out what is wrong.