The scheme proposed in this scheme can put multiple SCP together to be formed as a loadsharing group by the concept of visual GT

the SCP locates in different equipment rooms

each SCP in the group deals with the calls triggered by the users in a load sharing way.In case of failure of SCP equipment in any of the equipment rooms

service will automatically switched to other SCP within the group

thus

the service will still be shared by the rest of SCP normally.In such way

disaster recovery issue can be effectively solved without wasting equipment and adding system complexity.