| 摘要 |
<p>The present invention discloses a call method, device and communication system for private branch exchange (PBX) user, which belongs to the technical field of communication. By the present invention, user data of a PBX user can be sent to an application server (AS) in the circumstance that the PBX user has already subscribed but not registered, thus enabling the AS to continue a normal calling using the user data of the PBX user, and enabling the PBX user to successfully make a call without separate registration when the user is performing an independent supplementary service.</p> |
