R2是随路信令的一种，它满足半自动及全自动业务的各种要求，在国际上有较广泛的应用。
As one of the channel associated signaling, R2 meets all kinds of demands in the semiautomatic or automatic operations and has wide applications in the international area.
我国目前的电话网是数模混合的，所以我国目前的信令系统也处于随路信令和公共信道信令并存的阶段。
Our country present telephone network is mixed by digital mode and analogy mode, so our country present signaling system is at the stage of CAS and CCS commixture .
我国目前的电话网是数模混合的，所以我国目前的信令系统也处于随路信令和公共信道信令并存的阶段。
Our country present telephone network is mixed by digital mode and analogy mode, so our country present signaling system is at the stage of CAS and CCS commixture .
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