Description
Business-grade SIP phone lines — voice over the internet.
Quick, clear business calling over your internet connection. SIP phone lines replace traditional copper landlines and ISDN — no dedicated private network required, and you can use any internet provider. PAYG from $5/line or Unlimited from $25/line.
- Voice calling over the internet
- Use any internet provider
- No dedicated private network
- PAYG or Unlimited per line
- 13/1300 calls 35¢ per call
The modern, future-proof replacement for ISDN.
With Australia’s copper PSTN and ISDN networks decommissioned, SIP is the business-grade way to keep talking — on the internet you already have.
Voice over the internet
Your calls travel as data over your internet connection — clear, reliable business voice without legacy copper or ISDN infrastructure.
Use any internet provider
No dedicated private IP network and no specific broadband provider required. SIP lines work over the standard internet connection you already have.
Scalable — 1 to 100+ lines
Add or remove lines as your business grows or downsizes — no expensive hardware changes. Whether you need one line or a hundred, Comstel scales to match.
Keep your existing numbers
Port your current business numbers across to SIP. Your clients keep calling the same numbers — what changes is the cost and flexibility of your lines.
Works with your phone system
Compatible with IP phones, softphone apps and hosted PBX platforms including iPECS Cloud, Avaya and BizTel — and connects to legacy PABX systems via an adaptor.
Fast setup — live in days
Traditional ISDN provisioning could take weeks. SIP lines can be live within days, with Comstel ICT guiding onboarding, compatibility checks and deployment.
PAYG or Unlimited — priced per line.
Both plans are billed per line, per month. Add as many lines as you need — multi-line discounts available.
- Local calls — 6¢ per call
- National calls — 8¢ per call
- Mobile calls — 14¢ per call
- 13/1300 — 35¢ per call
- Low monthly fee — pay per call
- Unlimited local calls
- Unlimited national calls
- Unlimited mobile calls
- 13/1300 — 35¢ per call
- Flat rate — no bill shock
At a glance — PAYG vs Unlimited.
Comstel SIP lines are ideal for.
Replacing ISDN / PSTN
Still on old copper landlines? SIP is the modern replacement. Migrate at your pace, keep your numbers, and move off decommissioned infrastructure.
Customer Service & Call Centres
High-volume inbound and outbound calling on flat-rate pricing. The Unlimited plan’s predictable $25/line billing removes per-call surprises in busy periods.
Offices With a PBX / PABX
SIP connects to your existing PABX via an adaptor — no need to replace your phone system or handsets. Extend the life of your current investment.
Moving to Cloud Phone Systems
Connecting to iPECS Cloud, Avaya or BizTel? Comstel SIP lines are an ideal backbone, integrating with major Australian hosted PBX platforms.
Common questions about SIP phone lines.
What are SIP phone lines?
Do I need a special internet connection?
PAYG or Unlimited — which should I choose?
What about 13/1300 and international calls?
Can I use my existing phones and system?
Can I keep my number, and how many lines can I get?
Upgrade your business phone lines.
Tell us how many lines you need and we’ll recommend PAYG or Unlimited, check compatibility, and have your SIP lines live with minimal disruption.
Talk to the Comstel team
Australia’s business SIP experts — setup, porting and support from one Sydney team.
Thanks — we’ve got it.
A Comstel ICT team member will be in touch shortly. Need us sooner? Call 1300 070 747.
Talk to Comstel ICT — SIP made simple.
We’ll assess your current setup, recommend PAYG or Unlimited, port your numbers and have your SIP lines live with minimal disruption. Multi-line discounts available.
Pricing is per line, per month. Call rates apply per call as listed; 13/1300 calls are charged at 35¢ per call on all plans. International call rates apply and are not included in any plan. A standard internet connection is required; Comstel ICT will confirm suitability during onboarding. Pricing is subject to change — contact Comstel ICT for current confirmed rates. Multi-line discounts available. Comstel ICT · Level 7, 161 Walker Street, North Sydney NSW 2060 · 1300 070 747 · sales@comstel.com.au
