What Is Call Queuing and How Does It Work?

When all your staff are on the phone and another call comes in, something has to happen. Without a call queue, the caller hears an engaged tone and hangs up. With a call queue, they stay on the line, hear hold music or a message, and wait until someone is free. That is the core of it.

This guide explains what call queuing is, how it works technically, how to configure it, and when it makes sense for your business.

What Is Call Queuing?

Call queuing holds incoming callers in a virtual waiting line when all your agents or staff are busy. Instead of rejecting the call with an engaged tone, the system accepts it, places it in a queue, and connects it to the next available person.

The caller does not need to do anything. They wait on the line. Your system works through the queue in order, connecting each caller as a member of staff becomes free.

It is standard on modern business phone systems and is one of the features that separates a VoIP system from a basic mobile or landline setup.

Engaged Tone vs. Call Queue: Why It Matters

An engaged tone tells the caller one thing: try someone else. Most will. If you run a GP surgery, a pharmacy, a letting agent, or any business that takes a high volume of inbound calls, the engaged tone is not a neutral outcome — it is a lost caller.

A call queue changes that dynamic. The caller knows their call has been accepted. They hear hold music or a recorded message. They know someone will answer. Most will stay on the line, especially if the wait is short and the messaging is clear.

For businesses where the phone is a primary channel — booking appointments, taking orders, handling queries — the difference between an engaged tone and a queue can have a direct effect on revenue and customer satisfaction.

How Call Queuing Works Technically

Automatic Call Distribution

When a call arrives and all lines are busy, the system routes it to a queue rather than returning an engaged signal. This is handled by ACD — Automatic Call Distribution. The ACD decides where the call goes based on rules you configure: which queue, which agents are assigned to that queue, and how calls are distributed among them.

Position Announcements

Once a caller is in the queue, the system can tell them where they stand. A position announcement plays at set intervals — for example, every thirty seconds — and tells the caller they are third in the queue, or second, or next. This reduces hang-ups. A caller who knows they are next is far more likely to stay than one who has no information at all.

Hold Music and Messages

While callers wait, the system plays audio. This can be generic hold music, a custom recording, or a mix of both. Many businesses use this time to play a brief message — their opening hours, their website address, or a prompt to visit an online booking system if the wait is too long.

Timeout Options

Every queue has a timeout setting. If a caller has been waiting longer than a set period — say, three minutes — the system can take an action. That might be diverting the call to voicemail, forwarding it to a mobile number, or playing a message asking the caller to call back. This prevents callers from waiting indefinitely with no resolution.

Queue Types

Simple Linear Queue

The most common type. Calls arrive and are held in the order they came in. When an agent becomes free, the call that has been waiting longest is connected first. This is the default for most SME setups and is appropriate for the majority of small and medium businesses.

Priority Queuing

Some systems allow you to assign priority levels to certain calls. A VIP customer, a returning caller, or a call from a specific number can be pushed to the front of the queue. This is more common in larger contact centre environments.

Skills-Based Routing

At the more advanced end, skills-based routing sends calls to the agent best placed to handle them — a technical specialist for a billing query, for example. This requires more configuration and is typically found in dedicated contact centre platforms rather than standard SME VoIP systems.

Key Queue Settings

Maximum queue size controls how many callers can be held at once. If your queue is set to a maximum of five and a sixth caller rings in, the system triggers the overflow action rather than making them wait.

Timeout sets how long a caller can wait before the system diverts them. Set this too long and callers abandon the queue. Set it appropriately and you give your team a realistic window to answer while ensuring no one waits indefinitely.

Position announcement frequency determines how often the system tells callers their position. Every thirty seconds is common. Too frequent and it becomes intrusive; too infrequent and callers lose confidence.

Hold audio is the recording or music played between announcements. A professionally recorded message will always sound better than royalty-free elevator music, and it is worth investing a small amount of time in this if your queue handles a significant call volume.

Overflow Routing

Overflow routing is what happens when the queue is full or the timeout is reached. You configure a destination in advance so the system always has somewhere to send the call.

Common overflow options include diverting to voicemail, forwarding to a mobile number, playing a message and disconnecting, or routing to a different ring group or department. The right choice depends on your business. A GP surgery might send overflow calls to voicemail with a message to call back or use the online booking system. A trades business might forward to a mobile so no lead is missed.

Overflow routing is not a fallback for poor queue design — it is a deliberate part of how you handle demand.

Call Queuing vs. Ring Groups

These are two different tools that are often used together but are not the same thing.

A ring group rings multiple staff simultaneously when a call arrives. All phones in the group ring at once, and the first person to pick up takes the call. If no one answers within a set time, the call diverts to voicemail or another destination. Ring groups work well for small teams where someone is almost always available.

A call queue holds the caller on the line when everyone is busy, rather than diverting immediately. It is designed for environments where staff are genuinely occupied and callers are expected to wait.

Many setups use both. A ring group handles the initial call — ringing all available staff — and if no one answers within a few rings, the call enters a queue. This gives staff a chance to pick up immediately while ensuring the caller is held if they cannot.

When Call Queuing Makes Sense

Call queuing is most valuable in environments where inbound call volume is high enough that staff are regularly occupied when new calls arrive. GP surgeries and pharmacies are the obvious examples — Monday morning call volumes can overwhelm even well-staffed teams, and queuing is often the only way to manage demand without losing callers.

Busy service businesses — plumbers, electricians, popular restaurants taking reservations, letting agents, legal practices — also benefit if calls are frequently missed or callers regularly hit an engaged tone during peak periods.

If your business receives five or six calls a day and staff are rarely on the phone at the same time, a simple ring group and voicemail will serve you better. The overhead of configuring and managing a queue is not justified for low-volume inbound environments.

When Call Queuing Does Not Make Sense

Call queuing is not appropriate for every business. If your inbound volume is low and staff are almost always available, a ring group is simpler and more effective. Adding a queue when there is no genuine need can make a small operation feel impersonal — callers sitting in a queue of one when someone could simply pick up is unnecessary friction.

The honest test is whether your callers are currently hitting engaged tone or going unanswered during busy periods. If they are not, a queue adds complexity without adding value.

How to Configure a Call Queue on VoIPninjas

Call queuing on VoIPninjas is configured through the admin portal. You do not need any technical knowledge to set it up — the portal walks you through each option.

The basic process involves creating the queue, assigning the agents or extensions that will receive calls from it, setting the maximum queue size, choosing your hold audio, configuring the position announcement frequency, and setting the timeout and overflow destination.

Changes take effect immediately. You can adjust settings at any time — increasing the queue size during busy periods, swapping the hold audio, or changing the overflow destination to a different number or voicemail box.

Call Queuing on the Samurai Plan

Call queuing is available on the Samurai plan at £14.99 per user per month. The Samurai plan also includes call recording, auto-attendant, a mobile app, DDI numbers, ring groups, and voicemail-to-email. All on a 28-day rolling contract with no long-term commitment.

If you are running a business that takes a meaningful volume of inbound calls, the Samurai plan gives you the full suite of tools to handle that volume properly — not just queuing, but the broader infrastructure around it.

Try VoIPninjas free for 14 days — no card required, live within 10 working days. Call us on 0330 043 2388 or get started at voipninjas.co.uk/get-started/.

Frequently Asked Questions

Does call queuing work on VoIP systems?

Yes. Call queuing is a standard feature of VoIP phone systems and is far more accessible on VoIP than on traditional landline setups. Because VoIP runs over the internet, call management features like queuing are handled in the cloud and configured through a web portal — no physical hardware required.

How many callers can I hold in a queue?

This depends on your settings. You configure a maximum queue size in your admin portal. When that limit is reached, further callers are routed to your overflow destination instead — typically voicemail or a forwarding number. For most SME setups, a maximum of five to ten queued callers is sufficient.

Will callers hear silence while they wait?

No. While in the queue, callers hear hold music, a recorded message, or a combination of both. You can upload custom audio through the admin portal. Position announcements are played at the interval you configure, so callers know where they are in the queue.

Is call queuing available without a long-term contract?

Yes. On VoIPninjas, call queuing is included in the Samurai plan, which runs on a 28-day rolling basis with no minimum term. You can start with a free 14-day trial — no card required — and cancel or change your plan at any time.