对于市场的原因，许多供应商带来一个单一的电话呼叫的SIP中继。
For marketing reasons, many providers associate a SIP Trunk with a single phone call.
电话系统上的一个选项，允许出局呼叫被放入一根或多根中继线路中。
An option on a telephone system which allows outgoing calls to be put in line for one or several trunks.
中继资料 API 只会传回指定之类别的直接成员宣告，而且需要 API 用户端执行其他呼叫，以查核阶层架构和列举继承的方法。
The metadata API returns only the direct member declarations for a given class and requires the API client to make additional calls to walk the hierarchy and enumerate inherited methods.
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