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The IMS (IP Multimedia Subsystem) can provide multimedia services between heterogeneous wireless networks. But the efficiency of the service session handoff will bring a significant impact to user experience. For the integration of heterogeneous wireless networks, we propose a SIP-based multimedia service session handoff method named MS2HM. To reduce the handoff delay between heterogeneous wireless networks, the MS2HM uses the methods of advance registration and old-new address temporary matching. We modeled the node processing delay and network transmission delay, and analyze the total delay and the packet loss rate of the MS2HM. The MS2HM can meet the low delay and low packet loss rate requirements of IMS service session handoff between heterogeneous wireless networks, and ensure the QoS of the IMS services.