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Home/Products/SIP trunk

SIP trunk: connect your existing PBX to the cloud

CapitalPBX connects the phone system you already own, hardware or software, to our cloud platform in Romania, over SIP trunking or SIP registration, using the external IP-PBX connector. You keep your equipment and your extensions, and calls routed through CapitalPBX pick up the cloud features. It is an option on Virtual PBX plans, not a standalone trunk product.

★★★★★20+ years of experience in telecom · Google rating 5.0, from real reviews published on our Google profile

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Overview

The system you already have, connected to the cloud

You connect your existing PBX through SIP registration or SIP trunking, with the external IP-PBX connector, without replacing the equipment you invested in.

  • Your PBX and handsets stay in service
  • Your extensions stay on your own system
  • Calls through CapitalPBX pick up the cloud features
Panoul CapitalPBX cu rapoarte de apeluri pe laptop și un telefon IP de birou conectat la sistem
Definition

Keep your PBX and add the cloud on top of it

You are not replacing the system you invested in. You link it to CapitalPBX, and the numbers, the cloud routing and a record of your calls are added on top.

What stays with you: the PBX, the equipment wired to it and the extensions your team knows by heart. They stay exactly where they are. You are not replacing them and you are not starting over.

What CapitalPBX adds: the numbers, the cloud routing and a record of your calls. Calls that come through us pick up the cloud features, and calls that stay between your own extensions carry on exactly as before.

What we do not do: we do not sell SIP capacity by the channel and we have no standalone trunk product. SIP connection is an option on Virtual PBX plans, for companies bringing their own PBX into our cloud. If you want the whole picture of the platform, not just the connection layer, it is on the VoIP telephony page.

Not sure it fits your setup? Ask a consultant before you change anything in your configuration.

Features

What you actually get

Two connection types

SIP registration or SIP trunking on a static IP. You choose based on what your PBX supports and how it is exposed on your network, not the other way round.

Your PBX keeps answering its own extensions

Routing follows the extension range you define when you connect, so calls for your team land where they already landed.

Calls stay on the record

Calls between the two systems are recorded and appear in the CapitalPBX call history, identified by the system they belong to.

Cloud features, for the calls that come through us

Calls that pass through CapitalPBX pick up the cloud features. Your PBX carries on doing what it did, with the cloud layer added on top.

Download the CapitalPBX mobile apps
CapitalPBX – Download on the App StoreCapitalPBX – Get it on Google Play
Worth knowing

What changes, and what stays the same

The system you invested in stays yours

Your PBX and the handsets connected to it keep their role, and the SIP connection happens without replacing them.

Your extensions stay on your own system

The one firm rule is that extensions on the two systems must not overlap, so we set the boundary between them at connection time.

Contract and invoice for a company or PFA

There is no activation fee, and the term follows the plan you choose.

Integrations

Calls from your connected PBX reach your CRM

Kommo, amoCRM, Altegio, Pipedrive, HubSpot, Salesforce, Zoho CRM, Zendesk, Bitrix24 and Microsoft Teams as an additional option. Connection is over API, and the same goes for in-house systems, over REST API.

Why CapitalPBX

Telecom technology, with local support in Romania

Not just software, but a team with over 20 years in telecom that joins you from setup to optimization.

20+years of telecom experience
5.0 ★real reviews on Google
a few daysfrom contract to the first call
GDPR · SOC 2data hosted in line with the EU
How it connects

How your PBX connects, in four steps

Between signing the contract and the first call there are a few days, and migration support is included. Not a few minutes, because the contract, the numbers and the testing each take their own time.

01

Add your existing PBX

In Cloud PBX settings you add it as an external PBX and give it a name, so you can recognise it in the panel.

02

Choose the connection type

Either SIP registration, with the connection details you get from the panel, or SIP trunking, if your PBX sits on a fixed IP address.

03

Define the extension range

You state which extensions belong to your system, and routing follows that range.

04

Apply the same settings on your own PBX

At the end you check in the panel that the connection status shows as connected.

Explore the platform

The other CapitalPBX products

Four products that work together, in a single platform.

Frequently asked questions

Quick answers

What does connecting my existing PBX to CapitalPBX mean?
It means you keep the phone system you have and link it to the CapitalPBX cloud over SIP. Your PBX stays with you, with its equipment and extensions, while CapitalPBX adds numbers, cloud routing and call records in front of it. Commercially it is the external IP-PBX connector, an option on Virtual PBX plans, not a separately sold product.
Which SIP connection types are available?
Two: SIP registration, or SIP trunking on a static IP. You pick the type when you add your PBX in Cloud PBX settings, based on what your equipment supports and how it is exposed on your network. The configuration steps and the technical requirements are documented at help.capitalpbx.ro.
Does it work with the PBX we have now?
Yes, if your system supports SIP. The connection works over SIP registration or a static IP, and that covers hardware systems, software systems such as Asterisk, and virtual PBXs hosted by another operator. We do not publish a compatibility list by model, so the check is concrete: you tell us what you run, and a consultant confirms the right connection type. Technical guides are at help.capitalpbx.ro.
What happens to the extensions we already use?
They stay on your PBX and keep answering there. When you connect, you define the extension range that belongs to your system, and routing follows that range. The firm rule is that extensions on the two systems must not overlap, so the boundary between them is set at the moment you connect.
Are calls through the connected PBX recorded?
Yes. Calls between the two systems are recorded and appear in the CapitalPBX call history, identified by the system they belong to. In practice you do not lose the record of your calls just because you kept your own PBX. Where exactly to find them in the panel is described at help.capitalpbx.ro.
Do you sell SIP channels separately, without a cloud PBX?
No. CapitalPBX does not sell SIP capacity by the channel and has no standalone SIP trunk product. SIP connection exists as an option on Virtual PBX plans, for companies bringing their own PBX into our cloud. If you are looking for wholesale SIP capacity for a system you operate entirely independently of ours, we are not the right provider.
How much does the external IP-PBX connector cost?
It is an option added to a Virtual PBX plan, not a separate price for a trunk. Plan and option pricing is on the pricing page, where you see the total before you sign. There is no activation fee, and the contract term follows the plan you choose.
How long does connecting an existing PBX take?
Count a few days between the contract and the first call, with migration support included. Configuring the connection itself happens in the Cloud PBX panel, but the timeline that matters to you also covers the contract, the numbers and the testing. We do not promise activation in minutes, because it would not be true.
Can we keep our current numbers?
Yes, porting existing numbers is possible, in line with nationally regulated timeframes, subject to availability and regulatory requirements. We do not give you a firm number of days here, because the process does not depend on us alone. If you prefer the other route, CapitalPBX can also allocate new numbers, through partnerships with local operators.
Let's get started

Tell us what PBX you have and we will tell you how it connects

Leave a number and a consultant will call you back. We go through which connection type suits your system, which numbers you need and which plan covers your situation.

1
Leave your details and choose a plan

Tell us about your team and your call volume, and we'll prepare a custom setup for you.

2
Guided setup

We activate your numbers, IVR, routing and the integration with your CRM, together with your team.

3
You start in a few days

Coordinated migration, so you don’t miss calls, with local support in Romania.

★★★★★5.0 on Google · Fast response from a real person

Request a call

A consultant will call you back as soon as possible.

Selected plan
Custom setup for your businessReal call and flow simulationNo hidden costs
GDPR compliant
Thank you! We'll call you back. A CapitalPBX consultant will contact you as soon as possible.
Oops! Something went wrong while submitting the form.
Resources

Recent resources and articles

Guides on cloud telephony, call centres and call automation.