3CX Multi-Site Phone System in Dubai — One Dial Plan Across Every Branch
Somewhere in your company right now, someone is dialling a colleague’s mobile to reach the other branch — because there is no extension to dial. If that branch is overseas, reaching your own team has become a decision instead of a habit. And when a customer asks for accounts, reception says “please call our other office on this number” — and the customer hears a company that is not one company. All of it is the same problem: two offices, no connection between them. Bridged on one 3CX dial plan, it reverses — Dubai can even dial a UK customer out through the UK office’s own line, as a local call showing your UK number, and the UK team can do the same into the UAE. This is what connecting them actually involves — and the honest trade-offs of each way to do it.
Vector Digital Systems has designed and installed business phone systems from Dubai since 2009, holds 3CX Titanium — the highest solution-provider tier 3CX awards — and runs its own two-country, one-dial-plan system between Dubai and Kochi every working day.
Three things you have stopped noticing — because they feel normal
Running offices that cannot reach each other costs three ways. None of them has a name on any report — they appear as habits everyone has learned to accept.
No way to just dial the other office
- There is no extension to dial — so staff hunt mobile numbers from contacts, or message first and hope for a call back
- Quick questions become voice notes; urgent ones become “try his mobile”
- The other office slowly stops feeling like the same company — because reaching it takes effort
- On one dial plan, the other office is three digits away — an intercom that happens to cross cities
The call that fell between offices
- A customer calls Dubai. The person they need sits in Abu Dhabi
- Reception gives them another number to dial — and the customer starts again from zero
- Some redial. Some reach voicemail. Some quietly call a company that answers as one company
- A transfer between branches should feel like a transfer to the next desk
The branch you cannot see into
- The branch has a number, not a system — calls arrive, but there is no way to know if they were answered, missed or lost
- Staff there use personal mobiles for everything else — when a salesperson leaves, their customer conversations go with them
- If something goes wrong with the branch line, the first sign is a customer mentioning it
- On one 3CX system, every call at every branch has the same recording, reporting and routing already running in Dubai
All three end the same way: the offices join one dial plan. There are two honest ways to build that — and which one fits your company comes down to a single question.
Two ways to join your offices — and the one question that decides it
In the next meeting, someone will ask: what happens to the branch phones if the connection between offices goes down? That question decides the design. Here are the two honest answers — and which one fits depends on one thing: does each branch need its own direct number that customers can call?
One system, with a branch box
The main office runs 3CX. Each branch gets a small connection device, and its phones become extensions of the main system — one central licence covers all sites.
- Best when branches make and take calls through head office's numbers
- The smallest branches may not even need a separate box — certain Yealink desk phones we stock act as the connection device themselves
- One licence, sized for everyone's simultaneous calls; one system to manage — with the health of every branch connection visible live from the main system
- Branch phones reach head office — and each other — as short-digit extensions
- Honest limit: if the link to head office drops, branch desk phones wait for it to return — the 3CX mobile app keeps working over the mobile network
Each site its own system, bridged
Each office runs its own 3CX on its own local carrier line and public number — and a 3CX bridge joins the two into one dial plan.
- Best when each site needs its own local number — a Sharjah number in Sharjah, a Kochi number in Kochi
- Built for cross-border offices: each site keeps its own Etisalat, du or local carrier line — carriers cannot serve outside their own country
- Outbound calls route through the right country — Dubai reaches UK customers out through the UK office’s line as a local call showing your UK number, and the UK team reaches UAE customers through the Dubai trunk the same way
- Honest strength: if the link between sites drops, each office keeps answering its own calls independently
What crosses the bridge — and what never does
The link between your offices carries your company's own traffic — internal calls, and calls on their way to break out at another site — across a secure connection between the two locations. Every call to the outside world still enters and leaves the public network through a site's own licensed carrier trunk — Etisalat or du in the UAE, the local licensed carrier abroad — exactly as compliant UAE deployment requires. Getting each site's trunk connected and registered is its own discipline: our 3CX SIP trunk configuration guide covers it end to end.
The topology we run ourselves
This page is not describing something we read about. Vector Digital runs the bridged design between its own offices — Dubai for sales and delivery, Kochi for the technical back-office. Two countries, two licensed local carriers, one dial plan. When a Dubai line rings and a Kochi engineer answers on an internal extension, that is the system doing its job — two buildings in two countries working like two floors of one office. The secure connection between the offices runs on FortiGate — the same network security we deploy for clients, so voice and the network were designed together from the start.
If the one question is already answered in your head, the design is already chosen. Send the locations and we confirm it — with the licence count and the AED figure — the same working day, delivered and handed over like every phone system installation we do.
What one dial plan feels like — by the end of the first week
The receptionist stops asking “which number is Abu Dhabi again?” A caller asks for accounts, and the transfer goes through like a transfer to the next desk — because on the dial plan, it is the next desk.
Nobody hunts a mobile number from their contacts to reach the branch. Dubai dials three digits and Sharjah answers; three more and the overseas office answers — an intercom that happens to cross cities. The distance stopped being felt.
One directory, every call recorded and reachable from one place, one greeting that answers every caller the same way whichever office they reached. When something needs changing, it changes once — and both offices are already up to date.
And the direction reverses: your Dubai desk dials a Manchester customer, the call breaks out on the UK office’s line, and the customer answers a local call from your UK number. The UK team does the same into the UAE through the Dubai trunk. Two offices stop being two locations and start being one company with two front doors.
What the system itself costs — the licence sized across sites, an appliance for each location that needs one, and the installation — is mapped in AED on our 3CX price guide for Dubai, and the full platform picture is on our 3CX telephone system Dubai hub.
Branch offices on one system — the working answers
We have a Dubai office and a Sharjah branch — should they share one phone system or each run their own?
Our branch phones go dead when the internet link drops — is that fixable?
Can reception in Dubai transfer a caller to Abu Dhabi like an internal extension?
How do calls between our own offices work?
Our second office is outside the UAE — can it still be on the same dial plan?
Can our Dubai office call UK customers through our UK office’s line?
Do we need two licences for two offices?
What happens to each branch's existing phone number?
Can our old Panasonic keep running at one branch while the other office moves first?
Which areas of Dubai and the UAE do you cover for multi-site work?
How long does connecting two offices take?
Two offices. One dial plan. Answered today.
Send five things on WhatsApp: your locations, the staff count at each site, whether each branch needs its own direct number, any existing number that must be kept, and the current setup at each branch — basic landline or existing system. The design, the licence count and the AED figure come back the same working day. The first internal call between your offices is closer than it looks.