Modern Voice Connectivity for Today's Business
Every business phone system needs a reliable connection to the telephone network — SIP Trunks provide that connection using your internet service, replacing traditional phone lines with a modern, flexible and scalable voice solution.
At calltime, we design SIP trunking solutions tailored to your communications environment, whether you're deploying a cloud phone system, Microsoft Teams Calling or an on-premise PBX, ensuring reliability and business continuity without unnecessary complexity.
What Is a SIP Trunk?
A SIP (Session Initiation Protocol) Trunk lets your business phone system make and receive calls over your internet connection, instead of relying on traditional copper or ISDN phone lines.
The result is a more flexible, scalable and cost-effective communications solution that grows alongside your business — whether you have five users or five hundred.
Replaces traditional copper and ISDN phone lines.
Why Businesses Choose SIP Trunking
A smarter alternative to traditional phone lines, delivering enterprise-grade voice over your existing internet connection.
Designed for Modern Communications
Whether you're migrating to the cloud or maintaining an on-premise investment, SIP gives you the flexibility to connect your business the way you choose.
Also ideal for Hybrid Communications · Multi-site Businesses
Outages Shouldn't Stop Your Business Communicating
SIP Trunks can be configured with intelligent failover and call routing, so inbound calls automatically redirect to alternative offices, mobile phones or backup services if your primary system becomes unavailable.
That means your customers can keep reaching your business when it matters most.
One Partner for Your Entire Communications Environment
Unlike providers who simply sell SIP services, calltime manages your entire communications solution — from Business Phone Systems and Microsoft Teams Calling through to Business Internet, Professional Business Numbers and mobile services, all through one experienced team.
- 01One supplier.
- 02One support team.
- 03One trusted Business Communications Partner.
calltimeOne team manages it all- Business Phone Systems
- Microsoft Teams Calling
- SIP Trunks
- Business Internet
- Professional Business Numbers
- Mobile Services
Frequently Asked Questions
Quick answers to the questions we hear most. Can't see yours? Book a free review and ask us directly.
What is a SIP trunk?
A SIP trunk connects your business phone system to the telephone network using your internet connection, replacing traditional copper or ISDN phone lines.
Will SIP trunks work with our current phone system?
In most cases, yes. SIP trunks can connect cloud phone systems, Microsoft Teams Calling and on-premise PBXs. We will check your system before anything changes.
Can we keep our phone numbers?
Yes. Your existing numbers, including 1300 and 1800 numbers, can usually be moved to your SIP trunk.
What happens if our internet or office goes down?
SIP trunks can be set up with failover, so incoming calls automatically divert to another office, mobile phones or a backup service.
How many calls can we make at once?
It depends on the number of channels on your trunk. We size it to your call volumes, and channels can be added as your business grows.
Why Businesses Choose calltime
Most providers recommend the platforms they sell.
At calltime, we provide independent advice backed by Australia's leading communications technologies — we assess your needs first, then design a solution that supports your growth, not a sales target.
Book Your Complimentary ReviewAustralian Support
Speak with a local team that understands your business.
Simple Deployment
Fast onboarding with minimal disruption.
Scalable Solutions
Technology that grows with your business.
Trusted Reliability
Stable platforms with enterprise-grade uptime.
Tailored Advice
Solutions matched to your operations and goals.
Ongoing Partnership
Long-term support, training and optimisation.
Complimentary Voice Connectivity Review
Whether you're replacing traditional phone lines, upgrading an existing PBX or deploying a new communications platform, we'll review your existing infrastructure and recommend the most suitable SIP solution — reliable today and ready for future growth.
Smarter connectivity. Better reliability. Communications designed around your business.