Secure call endpoint pairing

1. A method for secure call endpoint pairing, comprising:

during an active call at a call endpoint, sending receive call audio to a first wireless headset and receiving transmit call audio from the first wireless headset;

during the active call, receiving, from a second wireless headset, a request to conference into the active call, wherein the request includes a headset identifier of the second wireless headset, the headset identifier uniquely identifying the second wireless headset from among a plurality of wireless headsets,

wherein the request to conference into the active call is received in response to an operation of a user-operable control of the call endpoint;

in response to receiving the request, and during the active call, sending, to a headset registry server, the headset identifier of the second wireless headset;

receiving a response from the headset registry server, the response depending on whether the second wireless headset is approved at the call endpoint, wherein whether the headset is approved is based on the headset identifier; and

based on the response from the headset registry server, managing the request to conference into the active call from the second wireless headset.

2. The method of claim 1 , wherein managing the request to conference into the active call includes conferencing the second wireless headset into the active call based on the response from the headset registry server.

3. The method of claim 1 , wherein managing the request to conference into the active call includes blocking the second wireless headset from conferencing into the active call based on the response from the headset registry server.

4. The method of claim 1 , wherein the headset identifier of the second wireless headset includes a Bluetooth device address of the second wireless headset.

5. The method of claim 1 , wherein the headset identifier of the second wireless headset includes a portable part identity of the second wireless headset.

6. A method for secure call endpoint pairing, comprising:

receiving, by a headset registry server, from a call endpoint, and during an active call involving a first wireless headset at the call endpoint, a request from a second wireless headset to conference into the active call, wherein the request includes a headset identifier of the second wireless headset, the headset identifier uniquely identifying the second wireless headset from among a plurality of wireless headsets,

wherein the request to conference into the active call is received in response to an operation of a user-operable control of the call endpoint;

the request including a headset identifier of the second wireless headset and a call endpoint identifier of the call endpoint, wherein the headset identifier uniquely identifies the second wireless headset from among a plurality of wireless headsets;

in response to receiving the request, performing, by the headset registry server, a lookup for a previously defined association between the headset identifier and the call endpoint identifier;

based on a result of the lookup, determining, by the headset registry server, whether the second wireless headset is approved to conference into the active call;

generating, by the headset registry server, a response based on the determination; and

sending the response to the call endpoint.

7. The method of claim 6 , wherein the request includes an indication that the wireless headset has requested to pair with the call endpoint as a primary device.

8. The method of claim 6 , wherein the request includes an indication that the wireless headset has requested to conference into an active call at the call endpoint.

9. The method of claim 6 , wherein performing the lookup includes querying a headset registry containing a predetermined list of devices approved to pair with and conference into active calls at the call endpoint.