For intercom exchange, it has following facilities: direct call--when two extensions are calling each other, the system will connect them directly.
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- 在内线功 能上,实现了如下功能:主叫等待:主叫拨号后,如果未叫通被叫或 被叫忙,不需重新拨号,只要等待,系统自动完成接续。