Crossed-invite call handling

A local device configured to handle crossed-invites during set-up of an IP-based session with a remote device, the local device comprising:

• a processor;
• memory;
• a communication subsystem to communicate with a network over one or both wired and wireless connections to, under control of the processor, send and receive messages;
• and
• a session handling module to establish sessions with other devices, the session handling module including processor-executable instructions that, when executed by the processor, cause the processor to:
• receive an incoming session invite after sending an outgoing session invite before the outgoing session invite has been accepted,
• determine that the incoming session invite was sent by the remote device to which the outgoing session invite is also addressed,
• determine a remote device priority value from identifying information contained in the incoming session invite,
• compare the remote device priority value with a local device priority value to determine whether the remote device or the local device is higher priority;
• determine that the local device is higher priority;
• and
• while waiting for cancelation of the incoming session invite and acceptance of the outgoing session invite, detect a busy signal in response to the outgoing session invite and, on that basis, display an incoming call answer screen for the incoming session invite.

A non-transitory processor-readable medium storing processor-executable instructions for handling crossed-invites during set-up of an IP-based session with a remote device, wherein the processor-executable instructions, when executed by a processor in a local device, cause the processor to:

• receive an incoming session invite after sending an outgoing session invite before the outgoing session invite has been accepted;
• determine that the incoming session invite was sent by the remote device to which the outgoing session invite is also addressed;
• determine a remote device priority value from identifying information contained in the incoming session invite;
• compare the remote device priority value with a local device priority value to determine whether the remote device or the local device is higher priority;
• determine that the local device is higher priority;
• and
• while waiting for cancelation of the incoming session invite and acceptance of the outgoing session invite, detect a busy signal in response to the outgoing session invite and, on that basis, display an incoming call answer screen for the incoming session invite.