Most predictive-dialler comparison articles on the public web are sales material in disguise — either written by a vendor about its own product or by an SEO agency that has never actually run a call centre. This one is neither. Telebyte has installed, operated, or migrated all three platforms below in production UK environments, and this article documents what each one is actually good at, with reasonable detail about the cases where one of them is not ViciDial.
Three platforms appear on most UK contact centre shortlists in 2026: ViciDial, GoAutoDial, and Bitrix24. They are not exact like-for-like. ViciDial and GoAutoDial are predictive diallers first; Bitrix24 is a CRM with telephony built in. That difference matters more than the feature checklists suggest, and it drives most of the right answers below.
The shortlist at a glance
The features matter less than the model each platform sits inside. Get the model wrong and the feature comparison is academic.
| | ViciDial | GoAutoDial | Bitrix24 | |---|---|---|---| | What it is | Open-source predictive dialler | Open-source dialler (ViciDial fork) | All-in-one CRM with telephony | | Licence | GPL (free) | AGPL (free), commercial cloud tier | Per-user SaaS | | Underlying engine | Asterisk | Asterisk | Proprietary, with Asterisk hooks | | Hosted model | Self-host or third-party | Self-host or GoAutoDial Cloud | SaaS only at scale | | Real start cost | ~£150–500/mo for VPS + carrier | Similar to ViciDial, or £45+/user/mo on cloud | £45+/user/mo | | Customisability | Total — AGI, dialplan, direct DB | High, slightly less than ViciDial | Limited to the API and configured screens | | Polish | Functional, dated UI | More modern UI than ViciDial | Genuinely good UX | | Ideal team size | 5–500 agents | 5–100 agents | 1–25 agents | | Where it sits | Build-and-own | Build-and-own with smoother on-ramp | Buy-and-configure |
Below is the longer version of what each row hides.
ViciDial: the workhorse
ViciDial is the platform that exists because the others do. It is over twenty years old, written in PHP and Perl with MariaDB and Asterisk doing the heavy lifting, and operated by tens of thousands of contact centres worldwide — including, in the UK alone, dozens of FCA-regulated brokerages, claims firms, and outbound teams.
The combination of features that explains the staying power:
- Predictive, preview, manual, and inbound dialling modes all in one platform, with blended-campaign support.
- Total recording and retention control — recordings are plain WAV files on the local filesystem (or wherever you mount one), encrypted and indexed however your compliance team needs.
- Direct database access. The schema is documented, the queries are stable, and any in-house BI tool can read straight off MariaDB.
- Open source under GPL, which means the operator's option to take a tarball and move to a different supplier is always real.
The price of all that is the admin UI, which looks the way enterprise software looked in 2008 and works the way enterprise software worked in 2008. New administrators need a week of acclimatisation. Anyone who has only ever used a polished SaaS product will balk.
It is also a build-and-run platform rather than a buy-and-configure one. Linux competency is not optional. The right team for ViciDial has at least one engineer who is comfortable with Asterisk, sip.conf, dialplan logic, and the day-to-day operational reality of a Linux box. Without that, a managed tier — Telebyte's own or someone else's — is mandatory rather than optional.
Where ViciDial wins:
- Mid-to-large UK contact centres (10–500 agents) that want operational control and predictable per-call economics.
- Regulated firms with bespoke recording, retention, transcription, or sentiment-scoring requirements that no SaaS platform will accept as configuration.
- Teams that are going to integrate the dialler with three or more other systems — CRM, underwriting platform, custom reporting — via direct DB or AGI.
Where ViciDial loses (the honest answer):
- Solo operators or three-agent teams. The administrative overhead is not justified at that scale.
- Teams with zero Linux capability and no intention of buying it in.
- Operations that want a polished mobile agent app out of the box for hybrid working.
- Use cases where the dialler is incidental to a larger CRM workflow.
GoAutoDial: the smoother ViciDial
GoAutoDial began life as a community fork of ViciDial. The codebase has diverged enough that they are now distinct products, but the underlying Asterisk engine and the conceptual model — campaigns, leads, dispositions, hopper — are recognisably the same.
What GoAutoDial does better than ViciDial:
- UI. The admin and agent screens look like 2019, not 2008. Day-one onboarding for new agents is materially faster.
- GoAutoDial Cloud. A managed cloud tier (separate from the community edition) eliminates the Linux-competency requirement entirely if budget allows.
- Mobile agent web client. Works adequately on phones and tablets, which the ViciDial agent UI does not.
What GoAutoDial does less well than ViciDial:
- Community size. ViciDial's user community is roughly an order of magnitude larger. Obscure problems on ViciDial have public answers; obscure problems on GoAutoDial often do not.
- Release cadence. GoAutoDial Community Edition has shipped less frequently in recent years. The cloud tier moves; the open-source product moves slowly.
- Direct database stability. The schema has drifted enough between releases that third-party tooling written against one major version often needs work for the next. ViciDial's schema is, for all practical purposes, frozen.
GoAutoDial sits in an interesting spot in the shortlist: it is the right answer when ViciDial is almost the right answer but the deciding constraint is "the team can't take a week to learn the ViciDial admin UI". That is a real constraint for a lot of UK operations, and a real reason to pick GoAutoDial over ViciDial — particularly the Cloud tier, where the operational overhead is also offloaded.
Where GoAutoDial wins:
- Small-to-mid teams (5–50 agents) that want the ViciDial feature set with a friendlier interface and don't need bleeding-edge community support.
- Operations that need agent mobile working as a first-class scenario.
- Buyers who specifically want the optional cloud path so they can start with managed hosting and revisit self-hosting once the team is staffed up.
Where GoAutoDial loses:
- Anything that depends on a large public knowledge base for troubleshooting.
- Heavy customisation projects where the active divergence from the ViciDial schema bites every quarter.
- The largest deployments (200+ agents) — at that scale the ViciDial ecosystem is materially deeper.
Bitrix24: the CRM that happens to call
Bitrix24 is in this shortlist because it keeps appearing on it, not because it is the same kind of product. ViciDial and GoAutoDial are predictive diallers with a CRM bolted on. Bitrix24 is a CRM with a predictive dialler bolted on. The verb that goes in the middle is everything.
Bitrix24's strengths are real and worth taking seriously:
- End-to-end CRM workflow — leads, deals, tasks, calendar, document storage, internal chat. Everything one tool, everything in one UI.
- Genuinely polished interface. The UX is the best of the three by a clear distance.
- Mobile-first. Native iOS and Android apps, properly built, properly maintained.
- Built-in telephony pricing that includes inbound DDIs, outbound minutes, and recording out of the box for European destinations.
The catch is that the dialler underneath is adequate rather than excellent. It will run a predictive campaign and produce reports. It will not — without considerable effort — give an operations director the depth of campaign control that ViciDial gives out of the box: dial-level dispositions, agent skill routing, drop ratio targeting, blended-channel logic, list-rotation rules, custom IVR with database lookups in the dialplan.
If the contact centre is the centre of the business, this matters and Bitrix24 is the wrong shape. If the contact centre is one channel inside a larger CRM-driven sales motion — and especially if the alternative is buying both a CRM and a dialler from separate vendors and integrating them — Bitrix24 can be the right answer, especially for smaller teams.
The cost story is also genuinely competitive at low seat counts. A five-user Bitrix24 with built-in telephony, properly configured, will undercut a five-agent ViciDial install with a hosted CRM bolted onto it once integration time is counted. That cost gap closes and then reverses around the 15–25 user mark, after which the all-in-one tier starts being the more expensive option.
Where Bitrix24 wins:
- Small teams (1–25 agents) where the work is sales-pipeline-with-some-calling rather than calls-as-the-product.
- Operations that need their dialler, CRM, calendar, and lead management in a single tool with a single bill.
- Teams that don't want to think about Linux, SIP, or call-recording filesystems.
Where Bitrix24 loses:
- Dedicated UK outbound operations of any meaningful scale.
- Anything with a complex compliance posture around recording retention, redaction, or transcript indexing.
- Operations that need to integrate the dialler tightly with three or more external systems via custom logic — the API is fine, but it is not Asterisk-level flexible.
The hidden fourth contender: cloud-hosted ViciDial
A quiet pattern in 2026 is that the right answer for many UK operations is actually a fourth option: ViciDial running on a managed cloud tier with a competent hosting partner. That is the model Telebyte runs on its Managed Dialler tier — the ViciDial feature set and operational control, with the day-to-day Linux overhead handled.
The reason this option is rarely listed alongside the other three is that vendors love to compare their product to other products, not to "the same product with someone else managing it". For a buyer doing genuine due diligence, though, it is the option that often dominates the shortlist:
- Same feature set as self-hosted ViciDial.
- Same direct-DB customisability.
- Same regulatory posture.
- None of the Linux operational overhead.
- Predictable monthly cost.
It is more expensive than self-hosting and less flexible than a fully in-house team, but it sits in the sweet spot for the typical UK contact centre with 8–50 agents and no in-house Linux engineer.
A decision matrix
Strip out the marketing and the answer for most UK operations comes down to a small handful of inputs:
| If your operation is… | …the answer is usually | |---|---| | 1–5 agents, sales-with-calling | Bitrix24 | | 1–10 agents, dialler-led, no Linux team | GoAutoDial Cloud, or managed ViciDial | | 10–50 agents, regulated UK firm | Managed ViciDial | | 10–100 agents, in-house Linux team | Self-hosted ViciDial | | 100+ agents, multi-site | Self-hosted ViciDial across two regions | | Heavy CRM workflow, calls a side channel | Bitrix24 | | Heavy compliance, bespoke recording rules | Self-hosted or managed ViciDial |
A separate way of asking the same question: is the contact centre the product, or is calling a feature of the product? If the contact centre is the product, ViciDial — managed or self-hosted — wins on almost every dimension that matters at the 12-month mark. If calling is a feature of the wider product, Bitrix24 will get there faster and with less operational drag.
A note on the platforms not on this shortlist
The three options above are not exhaustive. Three more turn up on UK shortlists often enough to be worth a brief comment:
- Five9, NICE inContact, Genesys Cloud — enterprise cloud platforms. Excellent for 500+ agent operations with the integration budget to match. Almost always the wrong answer below 100 agents because per-agent cost dominates everything else.
- RingCentral / 8x8 / GoToConnect — unified-communications platforms with outbound dialling tacked on. Convenient if the operation already runs on one of them; mediocre as dedicated diallers. Most UK firms migrating off these platforms onto something else are migrating onto ViciDial.
- Aircall, JustCall, CloudTalk — modern startup-style business-telephony products. Pleasant UX, weak as predictive diallers. Suitable for small inbound-and-outbound mixed operations, miscast as the dialler for a true outbound floor.
Each is the right answer to a question. None of them are the right answer to the question this article is about.
Telebyte's actual recommendation
The honest summary, from Telebyte's perspective as a UK contact centre infrastructure specialist that has lived inside all of these products:
- Self-hosted ViciDial if there is in-house Linux capability and the contact centre is the product.
- Managed ViciDial (Telebyte's or any reputable hosting partner's) if there is no in-house Linux capability but the contact centre is the product.
- GoAutoDial Cloud if the friendlier UI tips the balance and the operation is small-to-mid.
- Bitrix24 if the contact centre is one channel inside a wider CRM workflow and the dialler bar is "adequate".
Whichever way the decision goes, the second-order considerations — SIP carrier selection, call-recording compliance posture, agent training, dispositions design — matter at least as much as the platform choice. Picking the right platform and configuring it badly is worse than picking the second-best platform and configuring it well.
Working through a dialler shortlist? Tell Telebyte what you're weighing up — Telebyte runs a free 30-minute review on UK shortlists, no pitch attached.