This product is either discontinued or we cannot get that from suppliers.
Jabra 0220-649 Dual-Prong Adapter, Connector: PJ-327 - male, Connector (Second End): RJ-9 - female, Cable Type: Dual-prong adapter, Black & Gold.
The Jabra PJ327 2 prong to RJ9 Conversion Plug 0220-649 is an audio adapter that helps you expands the use of your Headset to cover main telephone systems by using the PJ327 conversion plug.