A method and system for providing a service session using a call include: initiating a first call between a caller and a callee according to a callee address record; establishing a voice communication session during the call; modifying the caller address record; and initiating a second call between the caller and the callee according to the modified callee address record. A behavior of the second call differs from a behavior of the first call. In one embodiment, the callee address record is modified according to a modification request. In one embodiment, the callee address record includes at least one session initiation entry. The session initiation entry includes a session address attribute with information for establishing the communication session, a session communication method with a protocol used for the communication session, and a session data attribute with data information for sending over the communication session based on the session address attribute.