The JAC 100 is an economically priced headset which is compatible with most phones with a square type RJ11 headset jack. To see if your desk phone is compatible with this headset then please have a look at the FAQ section on the main product page. It is available in both one ear and two ear version (JAC 200) and comes with noise cancelling, fully adjustable headband.
The Jabra UC Voice 150 is a corded USB headset designed specifically for Unified Communications deployments (PC Computer, Skype Vonage etc). It is perfect for light use by office professionals in both small and large office environments. It comes in both 1 ear and 2 ear versions.