View source for Howto:RJ11 telephone jack pin assignement for the IP21 in Switzerland

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The pin assignment for the RJ11 telephone ports of the international IP21 is 3 and 4.  Although there is no real accepted standard for the RJ11 pin assignment for analogue phones, pretty much all over the world, pins 3 and 4 are used. 

However, in some countries different pin assignments are used such as pins 2 and 3 in Switzerland.  Unfortunately, there is no special adapter available so a special cable must be crimped individually.

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