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.
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.
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