What is call forwarding?

Call forwarding redirects an incoming call from one phone number to another destination — a different number, a mobile phone, a colleague, a call queue, or voicemail. The caller dials one number; the network or phone system delivers the call somewhere else, usually without the caller noticing.

It is one of the oldest and most-used telephony features, and the foundation for almost every modern routing behavior: follow-me, ring groups, after-hours handling, and AI receptionists all build on the same idea — separating the number someone dials from the place the call is answered.

Types of call forwarding

• Unconditional (always) forwarding — every call forwards immediately. Used when a line is unstaffed or a number is being migrated.
• Busy forwarding — forwards only when the line is in use, instead of returning a busy signal.
• No-answer (delayed) forwarding — forwards after a set number of rings, typically to a mobile or voicemail.
• Unreachable forwarding — forwards when the device is off or has no service, common on mobile lines.
• Selective (conditional) forwarding — forwards only calls from specific numbers, or during specific hours. Business systems extend this into full time-of-day and caller-based routing rules.

How call forwarding works

On a traditional landline, forwarding is a carrier switch feature toggled with star codes (for example, *72 to enable and *73 to disable on most US carriers). The carrier intercepts the call before it reaches your line and redirects it.

On a VoIP or cloud phone system, forwarding is a software rule. Because the number already lives in the cloud as a virtual number, the platform can apply richer logic: ring the desk app for 10 seconds, then the mobile, then a teammate, then voicemail with transcription — and change the whole flow per schedule or caller.

Call forwarding vs. call routing

Forwarding is the simple case: send this call somewhere else. Call routing is the general system: rules engines that evaluate caller ID, time of day, queue load, agent skills, and IVR choices before deciding where a call lands. Every routing system uses forwarding mechanics under the hood; the difference is how much intelligence sits in front of the redirect.

Business uses

• After-hours coverage — forward to an on-call mobile or an AI receptionist when the office closes.
• Remote and hybrid teams — one published number forwards to wherever each person actually works.
• Never-miss-a-call flows — no-answer forwarding to a second device cuts missed calls without hiring.
• Number migration — forward the old number while customers learn the new one (or skip the problem entirely by porting).

Common questions

How do I set up call forwarding?

On a mobile or landline, dial your carrier’s star code (commonly *72 followed by the destination number in the US) or use the carrier app. On a cloud phone system, forwarding is a setting in the admin portal — you pick the condition (always, busy, no answer) and the destination, and it applies instantly. Cloud systems also let different team members hold different forwarding rules on the same main number.

Does call forwarding cost anything?

Carriers may charge airtime or per-minute fees for forwarded legs, especially to mobile or long-distance destinations. On business VoIP platforms, forwarding between extensions, apps, and US/Canada numbers is typically included in the seat price — DialPhone includes it on every plan from $24/user/month.

Can callers tell their call was forwarded?

Usually not for a simple forward — the call connects normally. Some setups add a screening prompt (“call from…, press 1 to accept”), and forwarded calls can show either the original caller’s ID or the forwarding number’s ID depending on configuration. Business systems let you choose which, so you always know a call arrived through the main line.

What is conditional call forwarding?

Conditional forwarding only triggers in defined situations — line busy, no answer after N rings, device unreachable, specific callers, or specific schedules. It is the building block for business-hours routing: office line rings 9–5, forwards to mobile until 8 p.m., then goes to voicemail or an AI receptionist overnight.

See DialPhone call handling

AI business phone system → · Call routing → · Pricing →

Related guides

• Call routing — the rules engine behind every forward
• Hunt group — ring several phones in sequence or together
• Call queue — hold callers in line instead of forwarding away
• Auto attendant — menu-based forwarding (“press 1 for sales”)
• Virtual phone number — the cloud number forwarding is built on