| http://www.w3.org/ns/prov#value | - As mentioned above, in the case where there is a reception to the ISDN line 24 in calling between the ISDN line 24 and the SLT 22, by transmitting the synthesized output of the call waiting notification tone and the call signal of the ISDN line 24 to the SLT 22 without interrupting the call, the call waiting can be informed to the SLT 22.
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