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SIP Trunking

Upgrade your business communication with SIP Trunking—connect your existing PBX to the internet for reliable, cost-effective calling with no new equipment needed.

SIP Trunking

Get more from your PBX with SIP trunking

Connect to the cloud instantly

Connect to the cloud instantly

Seamlessly link your PBX to the cloud for faster operations, cost savings, and freedom from traditional capacity limits.

Scale your on-site contact center

Scale your on-site contact center

Enhance your contact center with SIP connectivity to avoid carrier and contract management across multiple countries.

Expand globally with ease

Expand globally with ease

Receive inbound calls worldwide through the cloud and make outbound calls anywhere with local number support.

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SIP Trunking vs Traditional Phone Lines: Which One is Right for Your Business?

A SIP Trunk replaces a traditional phone cable enabling you to make and receive voice (or video) calls over the internet.

Why businesses choose UnitedCloud as their SIP trunk provider

Global reach at local rates

Global reach at local rates

Make and receive local and international calls at cost-effective rates, keeping your business connected worldwide without high fees.

Basic call management features

Basic call management features

Optimize call handling with essential features like intelligent routing, ensuring calls reach the right place every time.

Automatic failover

Automatic failover

Stay connected even during outages—automatic failover ensures seamless call continuity by rerouting to backup systems.

Frequently asked questions

What is a SIP trunk line?

A SIP trunk line is a group of virtual phone lines combined into a single digital connection, known as a trunk. It connects an on-site PBX to the Public Switched Telephone Network (PSTN) over the internet, replacing traditional copper phone lines and enabling cost-effective, scalable communication.

How many SIP trunks do I need?

Most businesses only need one SIP trunk per location or team. However, the number of sessions (simultaneous calls) required depends on your call volume. For example, if you have 20 sessions within a single SIP trunk, only 20 calls can occur at once—any additional callers will receive a busy signal. Need help determining the right setup? Read more here.

Do I need to replace my existing PBX to use SIP trunking?

No, SIP trunking allows you to keep your current PBX and use the internet for calls. This lets businesses modernize their systems without investing in new hardware.

How reliable is SIP trunking?

SIP trunking is highly reliable when paired with redundancy features like automatic failover, which reroutes calls to backup systems in case of an outage. UnitedCloud’s network is built for maximum uptime and call quality.