Reference:Configuration/FXS/Signaling

The call signalling settings of the analogue TEL interfaces can be adjusted here:

• Disable: Disables the relevant analogue TEL interface.
• Speech Bearer Capability: Calls on the relevant interface are transmitted with Audio Bearer Capability as standard.
  A checked check box transmits calls from the relevant interface with Speech Bearer Capability. This only makes sense if only telephones are operated on the relevant interface (no fax machine or modem).
• Create Metering Pulses: A checked check box generates charge or tariff pulses at intervals on the relevant interface.
• No Call Waiting: A checked check box disables the call waiting signal for waiting calls on the relevant interface. Instead, Call busy is signalled to the calling side. This is necessary if, for example, a fax machine is operated on the relevant interface.
• Passive: Transfers the relevant interface to the passive mode. As a result, the Flash/Hook signal (R key) is not evaluated.
• No Call Transfer on Hook-On: A checked check box disables the call transfer function. Per default calls will be transfered on hook on. Afterwards a call has been established, this call can be held and a new call can be initiated by clicking the R-Key. If the new call has been established, the held and waiting call can be transmitted to the new call by hook on the handset.
• Volume: Sets the volume for the relevant interface, in decibel (db), between -32db and +32db. No value or the value 0 is equal to the factory settings.

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