For trunk calls requiring Authorization Codes, the trunk alerting timer is set based on the COR of the Authorization Code.

The trunk alerting timer does not apply to outgoing trunk calls that are emergency or service calls. Specifically, the trunk alerting timer does not apply to the following ARS call types: alrt, emer, nsvc, op, svcl, svfl, svct or svft.

If a station is on a bridged appearance during a trunk call, the system sets the trunk alerting timer based on the COR assigned to the primary extension of the bridged appearance, unless you configure the system to use the trunk COR.

When a public trunk call is added to a conference call, the trunk alerting timer is set based on the Class of Restriction (COR) of the first public-trunk party added to the call. On the other hand, the tone repetition timer is based on the Trunk Alerting Tone Interval (seconds) field in the system parameter features form, and it will continue to play at the interval administered in the system parameter features screen, regardless of any additional public-trunk calls added to the conference. The trunk alerting timer remains active until all the parties connected via public-trunk drop from the conference call.

To accommodate individuals with accessibility issues, set the trunk alerting timer to a large value to provide users with adequate response time.

The trunk alerting timer does not apply to emergency calls.

If an agent receives a call from a public trunk or an agent makes a call to a public trunk, playing a zip tone to an agent depends on the Class of Restriction (COR) of the public trunk and not on the agent.

If a station-to-station call is redirected to a destination on the public network through Off-net Call Coverage or Call Forwarding, the trunk call is subject to the trunk alerting timer. The trunk alerting timer is set based on the COR of the calling party, unless you administer the system to use the trunk COR.

This feature is disabled when the Internal Users Only field is enabled.

This feature is disabled when the Internal Users Only field is enabled.

If the COR for Personal Station Access (PSA) Dissociated Sets is assigned and a trunk call is made from a dissociated phone, the trunk alerting timer is set based on the PSA COR.

If a call originating from a remote access extension accesses a public network trunk, the outgoing trunk alerting timer is set based on the barrier code COR or authorization code COR, depending upon administration of the Remote Access.

When the Internal Users Only field is activated, and an internal user either receives a call from a public trunk or makes a call to a public trunk, the user will hear a zip tone at regular intervals, which is determined by the Trunk Alerting Tone Interval.

However, when a Service Observer starts monitoring an internal user's call, both Service Observer tones and the Trunk Alerting Tone will be played intermittently based on a first come, first served basis. If, by any chance, the timers for both types of tones expire nearly simultaneously, the tone that was activated later will be given priority, and it will be played to the user.

If a locked station makes an outgoing trunk call, the outgoing trunk alerting timer is set based on the Station Lock COR.

If the System Time changes while the timer is running, the trunk alerting timer is not cancelled or changed.

When an internal user engages in a call with a public trunk user and hears the trunk alerting tone, and if the system needs to play additional brief tones like bridging or conference tones, it will be played based on a first-come, first-served basis. For instances, if the timer for the trunk alerting tone expires, and the Communication Manager needs to play a conference tone at that moment, it will overwrite the internal tone, and vice versa.

When a call is transferred to a trunk, the trunk alerting timer is set based on the COR of the party initiating the transfer, unless you administer the system to use the trunk COR.

If a station transfers a trunk call to another station, the trunk alerting timer will not be reset after the transfer. The timer from the start of the original call remains active for the trunk.

The trunk alerting timer applies to outgoing and incoming trunks accessed through a trunk access code.

If an internal users call is redirected to EC500 (Extension to Cellular), DPT (Dial Plan Transparency), or IGAR (Inter-Gateway Alternate Routing) through a public trunk, then the internal user will not hear the warning tone.