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5.1.8.3.2.2 DTMF intercom call
Use the external device such as PPM-IT5 IP console to make the intercom call via VoIP, and select
the paging zones by using the DTMF keys.
1. First, create an [Integration Type] event.
2. Choose [DTMF] on [Source] option, and select the zones which the intercom call will be made by
the corresponding DTMF keys.