# Signalling

Various settings for acoustic signalling throughout the system can be found here.

Table 1. Enquiry during external connection
Parameter | Explanation
Ringing pattern at enquiry destination | The ringing pattern determines here at the internal destination if an external connection is to be put on hold in order to make an internal enquiry call.

Table 2. Tone signalisation
Parameter | Explanation
Conference, intrusion and call waiting tone | This is where you can specify how the acoustic signalling is to be played when establishing a conference, during intrusion and call waiting.

Table 3. Call waiting / intrusion exchange
Parameter | Explanation
Call waiting and intrusion on exchange connection | Call waiting and intrusion is also possible with a user while speaking if they are connected to an external caller. Call waiting and intrusion is not possible with a user while speaking if they are connected to an external caller.

Table 4. Direct forwarding
Parameter | Explanation
Immediate call forwarding on no reply | The call forwarding transfer delay set throughout the system is always active. Calls will be forwarded without delay if the previous call to this user has already been forwarded.
Call transfer without prior notice | This is where you can specify what will be signalled to a user forwarded without prior announcement: Ring back tone: The user hears the ring back tone. As defined in 'Music on Hold': The user on hold hears the signal defined in the system-wide settings for music on hold (Service / Music on hold view).

Parent topic: Multi site
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