| 摘要 |
The transmission protocol for forwarding telephone calls includes first determining whether a subscriber is at home. Having determined that the subscriber is not at home, a special server is used to take urgent messages which can then be re-directed to a dedicated telephone card held by the absent subscriber. The caller, having determined that the called subscriber is away from home, transmits a call to a server site for urgent messages (SVMU). A welcome signal is transmitted to the caller, inviting the caller to leave an urgent message (MU) on the urgent message server (SVMU). Following the verification of the existence of a dedicated telephone card for the absent subscriber at a distant site, an urgent message (MU) is created for the absent subscriber, to be received at the distant site.
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