Internal Calls in the System: Beijing Subscriber 6000 in the system directly dials short numbers to call
Shenzhen Subscriber 7000 in the system.
Incoming Calls from External Subscribers: Guangzhou PSTN (outside the system) Subscriber 76767676 dials ¡°77777777¡±, the trunk in the local system, then ¡°6000¡±, to call Internal Beijing Subscriber 6000.
Outgoing Calls from the System: Beijing Subscriber 6000 in the system dials ¡°021¡ê¡Ù56565656¡± to call Shanghai PSTN (outside the system) Subscriber 56565656.
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