下面是一个可以描述你描述的拓扑图的示例:

+-----------------+    +-----------------+
  |      1A         |    |      1B         |
  +-----------------+    +-----------------+
  |  HA SBC         |    |  HA SBC         |
  |  SIP Server     |    |  SIP Server     |
  +-----------------+    +-----------------+
  | 

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