The Jabra dual prong adapter expands the use of your headset to cover main telephone systems by using the PJ327 conversion plug. It has a PJ327 male connector at one end and a female RJ9 connector at the other end. The PJ327 conversion plug is an adapter to convert the standard RJ9 plug to the PJ327 dual prong plug. With modular 4/4 Western socket for Lucent Callmaster 0220-649.

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