Disaster tolerance and backup method, device and system for short messages, and related devices

The invention discloses a disaster tolerance and backup method, device and system for short messages, and related devices. When an IP_SM_GW breaks down, a VoLTE short message is delivered by a 2/3G network, so that a problem that a VoLTE user fails to receive the short message is solved. The disaster tolerance and backup method for short messages comprises the steps of determining whether an IP_SM_GW fails; if yes, simulating the IP_SM_GW to send a short message routing message inquiry request to an HSS/HLR of a short message receiving party; and sending a to-be-sent short message to the receiving party according to short message routing information carried in a response message returned from the HSS/HLR. 本发明公开了种短消息容灾备份方法、装置、系统和相关设备，用以当IP_SM_GW发生故障时，实现将VoLTE短消息改由2/3G网络下发，解决了VoLTE用户收不到短消息的问题。所述短消息容灾备份方法，包括：判断互联网协议短消息网关IP_SM_GW是否故障；如果是，则模拟所述IP_SM_GW向短消息接收方归属签约用户服务器HSS/归属位置寄存器HLR发送短消息路由信息查询请求；根据所述HSS/HLR返回的应答消息中携带的短消息路由信息，将待发送的短消息发送给接收方。