Method and system for registering a presence user with a presence service

A method performed by a registration server to register a communication device with a system that provides a service, the method comprising:

• receiving, from a communication device, a token request that includes a communication address;
• sending, to the communication device,
• via a first communication channel, a first token response that includes first security information;
• and
• via a second communication channel different than the first communication channel, a second token response that is addressed to the communication address and includes second security information;
• receiving, from the communication device, an authentication message that includes a combination of the first and second security information;
• sending, to the communication device, an authentication acknowledgement containing a universally unique identifier (UUID);
• and
• associating the UUID with the communication address for use in future communications with the communication device for providing the service.

A server apparatus comprising:

• a processor;
• and
• a machine readable storage medium containing instruction code for registering a user with a system to provide a service to the user, the instruction code being configured to be executed by the processor to:
• receive, from a communication device, a token request to register with the system, the token request including a communication address;
• send, to the communication device,
• via a first communication channel, a first token response that includes first security information, and
• via a second communication channel different than the first communication channel, a second token response, addressed to the communication address, that includes second security information;
• receive, from the communication device, an authentication message that includes a combination of the first and second security information;
• send, to the communication device, an authentication acknowledgement containing a universally unique identifier (UUID);
• and
• associate the UUID with the communication address for use in future communications with the communication device for providing the service.