If only two cables were connected (white and blue), then you bought the wrong uniphone.
You should have bought a uniphone for two-wire systems and you bought for multi-strand (4, 5 or 6). You just need to know if your system is digital or analog. The digital ones are e.g. Proel PC-255, Cyfral Smart-D, and the analog ones are e.g. Cyfral TCL, Cyfral Smart analog or similar.
However, it is best to check with your neighbor what type it should be, so as not to buy the wrong uniphone again.
You should have bought a uniphone for two-wire systems and you bought for multi-strand (4, 5 or 6). You just need to know if your system is digital or analog. The digital ones are e.g. Proel PC-255, Cyfral Smart-D, and the analog ones are e.g. Cyfral TCL, Cyfral Smart analog or similar.
However, it is best to check with your neighbor what type it should be, so as not to buy the wrong uniphone again.