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SIP Dialer vs Softphone vs Predictive Dialer (and Auto Dialer)

Updated 2026-09-30 · By the ZuteSIP team (ZuteSIP Inc.)

Short answer: A softphone is a SIP dialer app a person uses to place and answer calls by hand. A predictive dialer is contact-centre software that dials many numbers automatically and passes answered calls to free agents; an auto dialer simply works through a list. All of them need phone numbers and a SIP connection to reach the phone network.

These terms get mixed up because vendors use them loosely. This guide separates the layers: the number and SIP account, the app a human talks through, and the software that automates dialing. It also explains where ZuteSIP fits: we supply real numbers and SIP credentials, not the dialing software.

The three layers of any calling setup

Every business or personal calling setup has the same building blocks. First, a phone number connected to the public phone network. Second, a SIP account (username, password, server) that lets software use that number. Third, the software that actually places calls, which can be a simple dialer app, a PBX, or a contact-centre platform.

ZuteSIP covers the first two layers. Each real number, in 181 countries, comes with SIP credentials, plus a browser web dialer for manual calls. ZuteSIP does not provide predictive, power or auto-dialing. Tools that do, such as VICIdial, connect to ZuteSIP numbers through SIP, exactly like a softphone does.

Definitions in plain English

  • SIP dialer: any app or device that places calls using the Session Initiation Protocol (IETF RFC 3261). The term is often used for a simple keypad app.
  • Softphone: a SIP dialer that runs as software on a computer or phone, such as Zoiper, Linphone, MicroSIP, Bria or Groundwire. A human dials and talks.
  • Web dialer: a softphone that runs inside a browser tab, with nothing to install.
  • PBX: a phone system (Asterisk, FreePBX, 3CX, FusionPBX) that shares numbers among extensions and routes calls.
  • Auto dialer: software that dials a list automatically, often to play a recorded message or to connect one agent to each dialed call in turn.
  • Predictive dialer: software that dials several numbers per available agent, using statistics about answer rates and call lengths, and passes only answered calls to agents.
  • Power or progressive dialer: dials the next number automatically as soon as an agent is free, one call per agent, without the statistical overdialing of predictive mode.

Side-by-side comparison

FeatureSoftphone / SIP dialerAuto dialerPredictive dialer
Who dialsA person, number by numberThe software, from a listThe software, several lines per agent
Typical userIndividuals, small teams, remote staffReminders, notifications, simple campaignsOutbound contact centres with many agents
Needs agents onlineYes, the user is the agentNot always (message playback)Yes, a pool of agents
Calls per agent at onceOneOne or noneMore than one, adjusted by an algorithm
Risk of abandoned callsNoneLow to mediumHigher; regulated in many countries
Setup effortMinutesHours to daysDays, plus tuning and compliance work
Connects to numbers viaSIP accountSIP trunkSIP trunk
ExamplesZoiper, Linphone, MicroSIP, Bria, web dialersModes in VICIdial and many hosted platformsVICIdial and commercial contact-centre suites

SIP dialer vs softphone: is there a difference?

In everyday use, no. "SIP dialer" and "softphone" describe the same kind of app. Some people reserve "softphone" for full-featured clients with contacts, presence and call transfer, and use "SIP dialer" for a simpler keypad. Some hardware desk phones are also SIP dialers, just not soft ones.

What matters is that the app supports standard SIP registration, digest authentication and G.711 codecs. Any such app can log in to a ZuteSIP number with the per-number username and password.

Predictive dialer vs auto dialer

An auto dialer simply works through a list. In its most basic form it plays a recorded message, or it dials one number for each free agent. A predictive dialer is a specialised auto dialer: it predicts when agents will become free and dials ahead, so agents spend more time talking and less time waiting. The trade-off is that sometimes a person answers and no agent is available, which produces an abandoned or silent call.

Because of this, automated and predictive dialing is regulated in many countries. In the United States, for example, the FCC publishes rules on robocalls and telemarketing. If you run automated campaigns, check the rules in every country you call and get consent where required. Our acceptable use policy also applies to how numbers are used.

Connecting a predictive dialer to ZuteSIP numbers

Contact-centre software treats a ZuteSIP number as a SIP trunk. The steps are the same as in a PBX:

  1. Buy one or more numbers in the countries you call or receive calls from.
  2. Copy each number's SIP username and password from its page in the dashboard.
  3. In your dialer (for example VICIdial, which is built on Asterisk), create a SIP carrier or trunk pointing at sip.zutesipdialer.com on port 5060, or 5061 for TLS.
  4. Allow only G.711 µ-law and A-law, and set DTMF to RFC 2833.
  5. Assign the trunk to a campaign or outbound route and place a single manual test call before starting any automated dialing.

Capacity and fit

Each number includes 1,000 outgoing minutes and 500 outgoing SMS per month, with unlimited incoming calls and SMS, from $1.80 per month billed yearly ($21.60 per year). That allowance suits softphone users, small teams and support desks well. High-volume outbound dialing consumes minutes quickly, so estimate your monthly outbound minutes per number before planning a campaign, and ask support@zutesipdialer.com if you are unsure.

ZuteSIP also does not provide call recording, voicemail or a customer API. Where a contact-centre platform offers those features, they run on the platform side, not on the number.

Included on every plan

  • Unlimited incoming SMS
  • Unlimited incoming calls
  • 500 outgoing SMS per month
  • 1,000 outgoing minutes per month
  • SIP credentials, call forwarding and web dialer
  • Keep your number as long as you want
  • Works with WhatsApp, Facebook, Google, Telegram and thousands more
  • 7-day replacement guarantee — free new number if it doesn't work for you
  • 7-day money-back guarantee if the number is unused

Numbers from $1.80 per month, billed yearly ($21.60 per year). Pay with USDT or USDC.

Frequently asked questions

Is a softphone the same as a SIP dialer?

Practically yes. Both are apps that place calls over SIP; "softphone" usually implies software on a computer or phone rather than a desk handset.

What is the difference between a predictive dialer and an auto dialer?

An auto dialer dials a list automatically. A predictive dialer is a type of auto dialer that dials several numbers per agent based on expected answer rates, so agents wait less but some answered calls may be abandoned.

Does ZuteSIP include a predictive or auto dialer?

No. ZuteSIP provides real numbers, SIP credentials and a manual web dialer. Predictive and auto-dialing tools such as VICIdial connect to ZuteSIP numbers via SIP.

Can I use VICIdial with ZuteSIP numbers?

Yes. Add each number as a SIP carrier using sip.zutesipdialer.com, the per-number username and password, and G.711 codecs.

Do I need a predictive dialer for a small team?

Usually not. A few people calling by hand work well with softphones or the web dialer; predictive dialing is designed for larger outbound teams.

Are predictive dialers legal?

They are legal in many places but regulated, for example on abandoned calls and consent. Check the rules in each country you call before running automated campaigns.

Related guides and use cases

Related countries

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