Sequential (30)

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The Picture above shows that the telephone cache is shared with by 2 telecom companies. Those cache direct the system how to bind a telephone number to a physical address.
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1) The physical address of a mobile phone isn't fixed. 
2) The physical address of a desktop telephone is fixed. 

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John: However, you can do a one-to-many-binding.

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1) bind (a telephone_number, broadcast-object-1)

1) bind (a telephone_number, broadcast-object-1)

2) bind (a telephone_number, broadcast-object-2)

3) bind (a telephone_number, broadcast-object-3)

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