VoIP service

No flagfall fees, per second billing

Slash your monthly phone bills by up to 50% with GCOMM’s business grade voice service that’s delivered over our national broadband network. You’ll experience superior voice quality and have access to a wide array of features – at a cost your business can afford.

What is VoIP and how does it work?

Voice over Internet Protocol (VoIP) is a way to make calls over IP networks, such as the Internet or private IP. GCOMM implements the open SIP (Session Initiation Protocol) standard which is supported by all modern phone systems to leverage your existing PBX investment by using GCOMM’s national data network to make calls.

SIP can be installed on a PBX via SIP trunks and then connected to the GCOMM SIP service. The installation of SIP is simple and fast. Your PBX company simply configures your phone system for SIP routing and you are set to go. Instead of using traditional landlines, calls are made over GCOMM’s private IP network using business grade connectivity to achieve significant cost savings without compromising call quality.


Flexible and scalable to suite your business needs

You can use GCOMM’s voice solution to supplement your existing phone service by allowing all inbound calls to be delivered via your traditional landline and all outbound calls to be made via SIP. Or, you can have both inbound and outbound calls come through SIP to realise additional savings. The service is highly flexible and can be scaled to your business’s needs.


Why GCOMM’s VoIP service?

Independent of the Internet
We do not use the Internet to transport your calls like many ‘retail’ SIP providers do. GCOMM’s voice service is delivered over our high speed, high capacity private IP network that’s capable of supporting business grade call quality.

Guaranteed availability
The service comes with a comprehensive service level agreement which guarantees 99.90% uptime.

No flagfall fees
There are no fixed flagfall fees for establishing each call, as is the case with traditional telephone service providers.

Per second billing
In addition to our very low call rates, GCOMM’s voice service is based on per second billing helping you radically reduce your monthly phone charges.

Service advantages

Significant cost savings

Save up to 50% on your local, national and international calls by bypassing the expensive PSTN/ISDN voice telephone systems when using GCOMM SIP trunks instead.

High voice quality

Our state-of-the-art network infrastructure utilises advanced Quality of Service to ensure that you’ll receive the highest voice quality.

Scalable and flexible

You can use as many SIP trunks or lines as your business requires, from 1 to 100+ to maximise savings across your organisation.

Free inter-office communication

Reduce your phone bills by making free calls between your business locations, as SIP to SIP calls don’t cost anything.

Reliable and secure

Calls are transported via GCOMM’s private IP network ensuring reliability and security for your voice and data.

Number mobility

Your SIP numbers can be taken with you to any location, unlike the traditional telephone system.

Simple and easy

SIP is simple and fast to configure on your PBX and no changes need to be made to your existing telephone system.

Multiple feature options

Offers a number of features, mostly for free that would otherwise create additional charges on your phone bill.


Ideal for businesses that:

  • Have a high volume of outbound calls
  • Make a lot of calls to international numbers
  • Need to quickly and easily scale lines
  • Are moving to a location where traditional phone services can’t be delivered

“GCOMM’s voice services are designed for business – per second billing, no flagfall fees and high quality calls. You’ll save up to 50% on your telephony.”

Lorna Ryan,

Account Manager, GCOMM

Key service features

  • No flagfall, per second billing
  • New numbers available
  • Business grade call quality
  • IP only Voice trunks using the SIP (Session Initiation Protocol) standard
  • From 1 line to 100s of lines
  • Utilises private network links
  • Local, national, international or mobile call types supported
  • Inbound and outbound call services

Service requirements

In order for the Voice service to be provisioned, you must have a PBX that supports SIP (Session Initiation Protocol). You will also require a business grade broadband connection, for most businesses this means an Ethernet over Copper service with at least 2Mb dedicated for Voice.

Suggested broadband services for SIP:
Ethernet over Copper

Service activation process

Step 1: Confirm if the customer’s PBX supports SIP.

Step 2: Confirm if the customer has a business grade connection capable of supporting SIP.

Step 3: Customer submits an order for the SIP service from GCOMM.

Step 4: GCOMM provides a service completion advice with the SIP authentication details to the customer.

Step 5: Customer contacts their PBX support company for SIP re-configuration.

VoIP service FAQs

Q: How do I know if my PBX supports SIP?

A: You will have to contact your PBX support company to find out if the PBX you have supports SIP.

Q: Does GCOMM perform service configuration?

A: No, you must contact your PBX support company and ask them to configure the SIP service on your PBX.

Q: What type of connectivity do I need to have to be able to use the SIP service?

A: We recommend that you have at least a 2Mbps business grade broadband service from GCOMM. However, for the optimum quality of calls, a faster connection is recommended, such as Ethernet over Copper.

Q: Do I need to make calls through my computer?

A: No. Once you set up SIP, you can use it like a regular phone service.

Q: How many lines can I have?

A: You can have an unlimited number of lines, from 1 to as many as your business requires.

Q: Can I use GCOMM’s voice service for both inbound and outbound calls?

A: Yes, you can use SIP for both inbound and outbound calls. If you wish to use the service for inbound calls, a number will have to be assigned to all your inbound lines. This will require either new number be allocated by GCOMM or you can port your existing telephone number to GCOMM’s SIP service.

Q: What if I want to keep my current landline?

A: You can keep your landline. You can allow all incoming calls to come through your traditional landline and all outgoing calls through SIP to ensure your call costs are reduced.

Q: How does GCOMM charge for the voice service?

A: The service fee is determined based on the number of lines a customer wishes to activate.

Q: Is there a fixed start fee per call?

A: No, there is no initial fixed fee to establish each call (flagfall). The calls are charged on per second basis.

Q: Does the SIP service come with a service level agreement?

A: Yes, there is a 99.90% uptime service level agreement.

Q: Does the SIP service support calls to international and mobile phones?

A: Yes. You can make calls to local, national, international and mobile numbers using SIP.

Do you have a question that we didn’t answer? Visit our FAQ section or contact us directly and one of our experts will gladly provide you with the information you need.

Contact us regarding VoIP services

For more information about our VoIP service, contact us on 1300 221 115 or fill in the form below.

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