2.5mm to 3.5mm adapters difference

Hello,
does anybody know what the difference between AD-44 (http://europe.nokia.com/A4486274) and AD-54 (http://europe.nokia.com/A4487137)?
they look very similar, but compatibility list is absolutely different...
another thing I cannot understand - why AD-44 is not compatible with, for example, 3500c while it also has S40 and 2.5mm AV-connector...
Message Edited by argd on 30-Nov-2008 06:39 PM

AD-44 is a 2.5mm connection into the phone and the HS-44 has a 3.5mm connection into the AD-44.
AD-54 is a 3.5mm connection into the phone and the HS-45 has a 3.5mm connection into the AD-54.
The reason for the compatibility only on certain phones is that the phone has to have the necessary protocols that support the functionality of the AD-44/54 such as the music controls and answer end call.

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