In the external line “outgoing calls” configuration, we add an item “no-answer timer”. This item is used to limit the no-answer timer value when make outgoing calls. Please refer to attached figure.
By default, its value is zero that means the line will use system default no-answer timer value. If it is set a value, the line will use it firstly.
For example, if it is set to be “15”, then the line will force to release the call in 15 seconds if peer side doesn’t answer the call.