1. Which headset should I buy?
The headset adapter for a Cisco IP phones will work with most standard cell phone headsets, equipped with a 2.5mm stereo plug. Check list of compatible phones on the headset box - if it has more than one manufacturer is listed (ex. Motorola, Audiovox, Samsung, etc), is what you are looking for. If you have only one manufacturer (ex. only Nokia), most likely it will not work. I would recommend well-known brands - Plantronics, Jabra, RadioShack, but it will also work even with cheap no-brand headsets.
2. Will it work with my existing headset?
The answer is "it depends". If you have a headset with a 2.5mm stereo plug, and your phone is not a Nokia - you should not have any problems.
3. Will this adapter work with my office phone?
The answer again is "it depends". The Headset Adapter will definitely work with Cisco IP phones. It may work with Avaya, AT&T, and Lucent phones, but it will not work with Nortel, Meridian, and Norstar phones.
4. I have Bluetooth headset. I want to make it working with Cisco IP phone.
To use the Bluetooth headset with a Cisco IP phone, you should buy a "Bluetooth adapter for non-Bluetooth phones". The Bluetooth adapter is a transmitter with standard 2.5mm plug, which you will connect to the Cisco Headset Adapter. If you already have a Bluetooth headset, then you need only Bluetooth adapter. If you don't have headset - you can buy a bundle - Bluetooth headset with Bluetooth adapter. There are a couple of models available on the market:
Just Bluetooth Adapters:
* Jabra A210 Bluetooth Adapter for non-BT phones (Info) >> Get it on AMAZON.COM
* Jabra FreeSpeak multi-adapter with 2.5mm jack
* Cardo BTA-II Adapter for non-Bluetooth Phones (Info) >> Get it on AMAZON.COM
* Bluemate Non-Bluetooth Adapter
* Aristo Adapter Bluetooth adaptor for non-bluetooth phones
Bluetooth headsets with adapter:
Jabra BT200 for non-Bluetooth phones Support
* Cardo Scala 500 Bluetooth Headset With Adapter for non-Bluetooth Phones (Info)
* Gold Latern BLUETREK2 BlueTrek Headset for non-Bluetooth phones (Info)
* foneGEAR Universal 2.5mm Cord Free Headset (magnetic-induction) (Info)