The recommended headset Jabra BIZ 2400 II Duo (QD, cable) does not work for me with the corresponding smart cord Jabra GN1200 Smart Cord, with microphone amplifier (QD, RJ10). What is the reason for this? Do I still have to make settings on the phone?

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I would check the pin colours on the RJ connector. For RJ10, red is on the far right. Compare with the pin colours on the working handset cable. I had the opposite problem. On my phone I need RJ10

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Question about Yealink T19p

The recommended headset Jabra BIZ 2400 II Duo (QD, cable) does not work for me with the corresponding smart cord Jabra GN1200 Smart Cord, with microphone amplifier (QD, RJ10). What is the reason for this? Do I still have to make settings on the phone?