PCCB-I1: no-call-back

Moving from "PCCB-I4: cancel-pending" when the requesting MCPTT client receives a private call call-back cancel response from the target MCPTT client

Moving from "PCCB-I3: confirmed" when the requesting MCPTT client sends a response to a private call set-up establishment request from the target MCPTT client.

The information stored on the requesting MCPTT client for the target MCPTT user is deleted.

PCCB-I2: confirm-pending

Moving from "PCCB-I1: no call-back" when the rqeuesting MCPTT client has sent a private call call-back request and is awaiting the response back from the target MCPTT client.

Temporary state of the UE, while the UE awaits the response to the call back request from the target MCPTT client.

PCCB-I3: confirmed

Moving from "PCCB-I2: confirm-pending" when the requesting MCPTT client receives the private call call-back response from the target MCPTT client

The client stores the MCPTT ID of the remote client and the requesting client state. In this state, the client is expecting to receive a private call from the remote client.

PCCB-I4: cancel-pending

Moving from "PCCB-I3: confirmed" when the requesting MCPTT client has initiated a private call cancel request towards the target MCPTT client

Temporary state while the UE awaits the cancel response from the target MCPTT client.

PCCB-R1: no-call-back

Moving from "PCCB-R2: private-call-call-back-pending" upon initiating a private call to the requesting MCPTT client, and receiving the SIP 200 (OK) to the private call request.

The information stored on the target MCPTT client for the requesting MCPTT user is deleted.

PCCB-R2: private-call-pending

Moving from "PCCB-R1: no call-back" when the target MCPTT client has received a private-call call-back request from the requesting MCPTT client, and has confirmed this by sending a response to this client.

The client stores the MCPTT ID, target client state, urgency and time of request.