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Step 6 — The HLR completes the registration operation by sending the GSM MAP message UPDATE_LOCATION_ack that contains the HLR address. The gateway translates it into the Reg­istation Confirm (RCF) message with type UpdateLocAck and forwards it to the gatekeeper. Steps 7 and 8 — The HLR informs the old VLR of deregistration by sending the CANCEL_ LOCATION message. The old VLR deletes the VLR record for the iGSM MS. We note that the GSM authentication and encryption mechanism is disabled in this mes­sage flow. The reason behind disabling the GSM security procedures is to avoid distributing GSM secret information (such as Ki) to equipment. other than the subscriber identity module (SIM) card on the user side. This argument is especially true when the ISP is different from the GSM operator.	第六步：HLR通过发送包含HLR地址的GSM MAP消息UPDATE_LOCATION_ack完成注册操作。网关将它转变成类型为UpdateLocAck的“注册确认（RCF）”消息并将它转发给网守。 第七和第八步：HLR通过发送CANCEL_LOCATION消息告知旧VLR取消注册。接着旧VLR将iGSM MS的VLR记录删除。 注意：GSM的鉴权和加密机制在这个消息流中是被禁用的。禁用GSM安全性规程的原因是为了避免将GSM的秘密信息（如Ki）散布给用户端上用户识别模块（SIM）卡之外的设备。当Internet服务提供商（ISP）不同于GSM运营商时尤其是如此。
DEREGISTRATION Figure 5. The essage flow for iGSM deregistration. When an iGSM subscriber moves from the IP network to the GSM network, he/she may per­form registration at the GSM network (or mis­routing may occur, as described later). The standard GSM registration procedure is exer­cised. In this case, the iGSM gatekeeper is the “old VLR,” and the deregistration actions (i.e., steps 7 and 8 described earlier) are modi­fied. The message flow for iGSM deregistra­tion is illustrated in Fig. 5 with the following steps.	取消注册 图 5  iGSM取消注册的消息流程 当一个iGSM用户从IP网络移到GSM网络时，他/她需要注册到GSM网络（不然可能会发生错打问题，见下文）。执行标准的GSM注册规程。如果这样的话，iGSM网守就是“旧的VLR”，且取消注册动作（即之前所述的第七步和第八步）将发生改变。使用以下步骤描述iGSM取消注册规程，其消息流程见图5。
Step 1 — When the iGSM gateway receives the CANCEL_LOCATION message (with parameter IMSI), it translates this message into an unso­licited IRR message with type CanLoc and for­wards the message to the gatekeeper. The gatekeeper updates the iGSM database to indi­cate that the subscriber is no longer in the IP network and sends the Unregister Request (URQ) message to the terminal. Step 2 — The terminal shall respond with an Unregister Confirmation (UCF) message. The gatekeeper responds an Information Request Acknowledgement (IACK) message with type CanLocAck to the gateway, and the gateway forwards this information to the HLR by the CANCEL_LOCATION_ack message. After sending the UCF message, the terminal may change the alias address associated with its transport address, or vice versa, for other IP applications.	第一步：当iGSM网关收到CANCEL_LOCATION消息（和参数IMSI）时，它将这条消息转变成一条未经请求的且类型为CanLoc的IRR消息并将该消息转发给网守。然后网守将iGSM数据库更新，指示用户不再位于IP网络并向终端发送“未注册请求（URQ）”消息。 第二步：终端会使用一条“Unregister Confirmation（UCF，未注册确认）”消息进行应答。接着网守使用一条类型为CanLocAck的“信息请求确认（IACK）”应答网关，接着网关通过CANCLE_LOCATION_ack消息将这条IACK信息转发给HLR。 对其他IP应用来说，在发送完UCF消息后，终端可能会改变与其传输地址相关的别名地址，反之亦然。