Business telephony · Xivo · 3CX

Your telephony, ready for the end of the PSTN.

Xivo for sovereignty, 3CX for simplicity — DYB deploys the PBX that fits your organisation, manages number portability and trains your teams. PSTN landlines being switched off by Orange, remote working to industrialise, drifting hosted Centrex bills: we put telephony back under control.

−55%

Average monthly bill

2030

End of PSTN in France

12–18 months

Typical ROI

99.95%

Target availability

Request a telephony audit →Our managed services offerFree audit · Quote within 5 days · Portability included

The 2024–2030 context

The PSTN is being switched off, region by region.

Orange stopped selling new analogue and T0/T2 lines at the end of 2023. The phase-out of existing lines began in 2025 by regional plates and will complete around 2030. If your legacy PBX is still connected to PSTN, your calendar is tight.

2023
Definitive end of new PSTN and ISDN T0/T2 line sales by Orange.
2025–2030
Progressive switch-off of existing PSTN lines by regional plates — ARCEP schedule.
+30%
Average price rise observed on hosted Centrex offers since 2022 (micro/SME offers).
100%
Of analogue or TDM PBXs must be migrated or retrofitted (FXO/FXS gateways) before their plate is switched off.

Image to provide

ARCEP map of the PSTN phase-out schedule by plate

Map of France coloured by PSTN switch-off phase (waves 2025-2026-2027-2028). Highlight Valence/Drôme and 2-3 major cities to anchor local relevance.

Benefits

A modern telephony infrastructure: what it actually changes.

Based on real migrations carried out between 2022 and 2026 with SMEs of 10 to 250 users.

−55%

Monthly bill

On a 30-extension estate: €540/month (Centrex) → €240/month (Xivo + SIP trunk). Annual saving: €3,600.

×3

Provisioning speed

User creation/removal in 30 seconds via the admin interface, no carrier intervention. No more 3–5 day tickets.

+100%

Mobility

PC + mobile softphone included: your fixed number follows you anywhere. Remote working, travel, desk rotation — zero friction.

HD Voice

Audio quality doubled

G.722 or Opus codec at 7 kHz vs 3.4 kHz on PSTN. Natural voice, reduced listener fatigue, increased intelligibility.

CRM

Native integration

Click-to-call, customer screen pop on incoming call, automatic logging in HubSpot, Zoho, Salesforce or your custom ERP.

99.95%

Availability

High-availability architecture with redundant SIP trunk and PBX cluster. Near-zero telephony outages.

€0

Inter-site call cost

All your sites are on the same PBX. Calls Lyon ↔ Valence ↔ Paris go through internally, free and unlimited.

Compliant

Law & recording

Selective recording, GDPR-compliant legal archiving, call statistics (duration, wait, abandonment) — useful for quality and compliance.

Comparison

Hosted Centrex · 3CX · Xivo

Three models, three philosophies. We present the costed options in your audit, with no commercial bias.

Criterion	Hosted Centrex	3CX	Xivo
Licence model	SaaS billed per user/month	Annual licence or 3CX cloud	GPL open-source + optional support subscription
Monthly cost per user	€8 to €25	€0 to €7 (depending on SC or cloud)	€0 to €3 (support subscription)
Hosting	Carrier cloud (often foreign)	Pan-EU cloud or on-premise	On-premise or sovereign cloud (OVH, Scaleway)
Sovereignty & GDPR	Low to medium	Medium (HQ Germany)	Strong (FR · Avencall, auditable Asterisk code)
Dialplan customisation	Limited to the interface	Medium (Call Flow Designer)	Total (AGI scripts, source code)
Multi-site	Included	Included	Included (native Xivo clusters)
Mobile apps	Yes (depending on offer)	Polished native iOS/Android	iOS/Android (UC) + third-party softphones
Integrated video	Depending on offer	Yes (3CX Talk)	Yes (Jitsi · BigBlueButton integration)
API / CRM integrations	Limited	Native connectors (HubSpot, Salesforce, Zoho…)	Full REST API + custom AGI scripts
Vendor lock-in	High	Moderate	None (open-source)
Ideal use case	Micro-business 1–10 extensions, absolute simplicity	SME 10–500 extensions, strong mobility	SME 10–1000+, regulated sectors, complex dialplans

Our approach

Two solutions, two profiles. We choose together.

Sovereign · Open-source

Xivo

Open-source PBX based on Asterisk, published in France by Avencall since 2008. Our default choice when sovereignty, self-hosting and dialplan customisation matter.

Auditable Asterisk source code — zero closed-vendor dependency
Native multi-tenant and cluster for 100+ extension environments
Automatic provisioning of IP terminals (Yealink, Snom, Cisco)
Web admin interface + full REST API
Optional support subscription (€115–300/server/year)
Ideal for regulated sectors: healthcare, legal, OIV, defence

Ideal profile: 20–500 extensions, multi-site, strong sovereignty or compliance requirements.

Simple · Multi-OS

3CX

Commercial multi-OS PBX (Windows, Linux, Docker, Raspberry Pi). Modern mobile apps, turnkey CRM integrations and a competitive Pan-EU cloud offer. Our choice when simplicity comes first.

Free StartUP edition up to 10 users
Polished iOS/Android mobile apps with push notifications
Native Salesforce, HubSpot, Zoho, Microsoft 365 connectors
Integrated 3CX Talk videoconferencing (no plugin)
Docker deployment in less than an hour
3CX cloud hosted in Germany (GDPR compliant)

Ideal profile: 5–250 extensions, intensive remote working, off-the-shelf CRM integration as a priority.

What we will not sell you: a solution we do not master. DYB has been deploying Xivo and 3CX in production for several years with French SIP carrier partnerships (OVHcloud Telephony, Voxbone, Bouygues Entreprises) — no dependency on an intermediary reseller.

Scope

What a DYB VoIP infrastructure really covers.

PBX (Xivo or 3CX)

Heart of the system: users, groups, queues, IVR, unified messaging, statistics.

Carrier SIP trunk

Choice and negotiation of the SIP plan, multi-carrier redundancy, codec configuration (G.711, G.722, Opus).

IP phones & headsets

Yealink, Snom, Cisco, Polycom, Gigaset — automatic provisioning, unbox and plug-and-play on site.

PC & mobile softphones

Linphone, 3CX, Zoiper, or Xivo UC clients. Configuration via QR code, single sign-on.

IVR & queues

Multi-level auto attendant, ACD queue with strategies (round-robin, longest idle), personalised announcements.

Audio/video conferencing

Permanent conference rooms, integrated 3CX Talk video or Jitsi for Xivo.

Recording & stats

Selective call recording (with consent), real-time statistics, CSV/PDF exports.

CRM integration

Click-to-call, customer screen pop, automatic logging. HubSpot, Zoho, Salesforce or custom connectors.

Multi-site & remote work

All sites on the same PBX, free internal calls, secure remote access with no change in usage.

Number portability

Steering the portability from your outgoing carrier. Legal deadline 6 business days, in practice 2–4 weeks.

Network QoS

DSCP marking, voice VLAN, prioritisation on switches and routers. LAN/Wi-Fi audit included.

Emergency lines & lifts

Audit of critical analogue equipment (lift, alarm), FXS gateways or dedicated GSM solutions.

DYB method

Migration in 5 steps — progressive cutover, no outage.

Week 1

Existing audit

Inventory of phones and lines, carrier bills, real usage (6-month statistics), critical equipment (lift, alarm), LAN/Wi-Fi network.

Week 1–2

Target architecture

Xivo or 3CX choice, sizing, SIP carrier, numbering plan, IVR dialplan, deliverable: costed quote and cutover plan.

Week 2–4

Parallel deployment

PBX installation, users/groups/queues configuration, IP phone provisioning, full internal tests before cutover.

Week 4–6

Portability & cutover

Portability coordination with outgoing carrier, batch cutover (by department or site), backup curtain maintained for 48h.

Week 6

Training & operations

User training (1h on IP phone, 30 min softphone), admin training (3h), operations runbook, handover or managed services contract.

Image to provide

Multi-site VoIP architecture diagram

Diagram: head office with Xivo PBX + cluster, secondary sites with PoE switches, remote workers on softphone, SIP carrier at the top, link to the converged public PSTN network. Mermaid or Lucidchart style, DYB colours.

Technical stack

What we deploy at your site.

Xivo CE / Pro

Open-source PBX based on Asterisk. Multi-tenant, cluster, full REST API.

3CX (V20+)

Commercial multi-OS PBX. Free StartUP edition, SC or Pro depending on needs.

Asterisk

PBX engine under the hood of Xivo. Custom AGI scripts/dialplans possible.

Yealink · Snom IP phones

Reliable terminals, PoE, colour screen, compatible headsets. DHCP/TFTP provisioning.

Softphones

Linphone (FR open-source), 3CX Mobile, Zoiper. QR code configuration.

Carrier SIP trunk

OVHcloud Telephony, Voxbone (Bandwidth), Bouygues Entreprises, Orange Pro.

G.722 · Opus codecs

HD Voice by default. Fallback to G.711a depending on bandwidth.

PoE switches & QoS

Cisco, Aruba, Netgear ProSafe, Ubiquiti UniFi. DSCP marking, voice VLAN.

FXS/FXO gateways

Patton, Grandstream — to keep analogue equipment (lift, fax).

Image to provide

Office / IP phone in use photo

Photo of an open space or customer office with a Yealink or Snom IP phone visible on the desk. Prefer a bright, natural setting. Option: headset + softphone-on-screen photo.

Customer case

Accounting firm, 3 sites, 45 extensions — Xivo in 5 weeks.

−62%

Monthly bill vs Centrex

0 min

Total downtime during cutover

5 weeks

Total project duration

14 months

Return on investment

"Our hosted Centrex cost us €18/extension/month and each user creation took 4 days. After the Xivo migration, we are at €6.80/extension/month and our staff create their own accounts in 30 seconds. The portability happened without any customer noticing a thing."

— Partner, 45-staff accounting firm (Drôme)

Frequently asked questions

Everything you ask us before signing.

Do I have to replace my existing phones?

Not systematically. SIP IP phones (Yealink, Snom, Cisco, Polycom, Gigaset) are compatible with both Xivo and 3CX. Only ISDN analogue phones and Centrex devices with proprietary protocols need to be replaced. For 80% of the SMEs we migrate, we keep the existing fleet and add softphones (PC + mobiles) for new uses.

How much does a VoIP migration cost on average?

For a 30-user estate: €4,500 to €7,500 excl. VAT in project (audit, deployment, training, portability), then €60 to €180/month in operation (Xivo sovereign or 3CX cloud). To be compared with the €8 to €25/month per user of a traditional hosted Centrex: ROI reached in 12 to 18 months in the vast majority of cases.

Can we keep our existing numbers?

Yes. Portability of geographic and 0800/0810 numbers is guaranteed by law (article L44 CPCE). DYB drives portability with your target SIP carrier (OVHcloud, Voxbone/Bandwidth, Bouygues Entreprises, Orange Pro). Legal deadline: 6 business days, in practice 2 to 4 weeks depending on the outgoing carrier.

Xivo or 3CX: how to choose?

Xivo is our default choice when sovereignty, deep customisation and self-hosting matter (French SME, regulated sectors, multi-site with complex dialplans). 3CX is faster to deploy, has modern mobile apps and a competitive Pan-EU cloud — a good choice for organisations prioritising simplicity over control. We present both costed options in the audit.

Will analogue PSTN really disappear?

Yes. Orange stopped selling new PSTN lines in November 2023 and is progressively switching off existing lines by regional plates through to 2030. If you are still on PSTN or T0/T2 (ISDN), VoIP migration is no longer an option — it is a calendar obligation. Better to anticipate than to suffer.

Is remote working compatible?

Yes, natively. Users have a softphone (Linphone, 3CX, or Xivo app) on PC and mobile, configured once, which connects to the business PBX from anywhere. No difference with a fixed phone: they keep their internal and professional number, voicemail and call history.

What audio quality compared to my current landline?

Better. PSTN limits voice to 3.4 kHz. A VoIP infrastructure in G.722 (HD Voice) or Opus codec reaches 7 kHz — twice the bandwidth. The voice is noticeably more natural, especially in video. Provided you have a decent internet connection (5 to 30 kbps per call depending on the codec) and you have prioritised VoIP with QoS on your network, which we systematically configure.

How long to deploy a new VoIP infrastructure?

For 10 to 50 users: 2 to 4 weeks from order to go-live. For 50 to 250 multi-site users: 4 to 8 weeks. The effort peak is concentrated on the initial audit and number portability — the technical part (installation, configuration) only takes a few days. User training takes 1h on IP phone, 30 min on softphone.

What happens to my emergency line and lift?

Lifts and fire alarms have specific rules (NFP 82-208 standard, order of 22 October 2010). We usually keep a residual POTS line (analogue over fibre via FXS gateway) for these critical pieces of equipment for the duration of their life cycle, or we deploy dedicated GSM/M2M solutions. Audit mandatory at project start.

Can we integrate VoIP with our CRM or ERP?

Yes. Xivo exposes a REST API enabling click-to-call, customer screen pop, automatic logging. 3CX natively integrates Salesforce, HubSpot, Zoho, Microsoft Dynamics, and offers an open CRM API for custom tools. DYB builds specific connectors when your business ERP is non-standard.

Next step

Free telephony audit — costed, comparing Xivo vs 3CX vs your current Centrex.

Send us your number of extensions, your current monthly bill and your carrier. Within 5 business days we will return a costed comparison of the three scenarios + a cutover plan tailored to your PSTN switch-off calendar.

Request my audit →See DYB managed services

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