Why SIP? Why Now?
SIP trunking
October 18, 2018
SIP trunking is by no means a new invention, but it has recently seen a surge in use from businesses.

Why is this? SIP uses a physical PBX system along with an internet connection in order to make and receive calls via data transfers. For many businesses, this is the ideal first step into IP telephony.

As the impending 2025 switch off date for ISDN looms, it is estimated that ‘telecoms are losing an average of 700,000 landline customers per month’ [1]. But with almost 3 million ISDN channels still being actively used in the UK [2], it’s clear that not all businesses are ready to make the move.

Eventually, all businesses will be forced to look for the next step in their telephony journey. SIP is a way to appeal to an entire market of businesses who might not yet have made that step into IP based telephony.

SIP Protects Investments and Saves Money

Getting a customer to embrace IP telephony is not always easy and is often made worse by telling them they need to ditch their existing (and often very expensive) PBX system in order to do so.

SIP trunking protects investments and saves businesses money by making use of existing PBX hardware and handset estate.

As well as requiring less upfront investment than with ISDN, calls made over the internet through SIP generally cost less than those made over traditional phone lines.

SIP trunking

© Tempest,

Deployments For SIP TRunking Are Simple

There is no need to physically install or provision a line with SIP trunking. As the set up is virtual, you can have new customers up and taking and receiving calls in a fraction of the time.  Flexibility is the biggest selling point of SIP, especially when compared with the often complicated setup and lengthy delays of PBX machines.

Maintaining SIP systems is simple and cost effective. With ISDN, lines have to be installed and maintained physically which costs both significant time and money for the business. Highlight the simplicity and money saving potential of SIP to prospective customers and the product practically sells itself.


SIP trunking
The SIP Market is on the Rise

‘The SIP market is worth approximately £700m and this will grow to over £850m in the immediate future.’ [3] With so many businesses in the transitional period from ISDN to IP telephony, SIP is the bridge being adopted by many. Without asking customers to cut connection to their entire telephony system, SIP allows a seamless transition into VoIP while protecting their investment and set up.

For those seeking to capitalise on the rapidly expanding SIP marketspace, now is the time before every business has made the switch over to IP telephony.

Invosys SIP

Invosys’ SIP product is the ideal choice for resellers looking to take their first step into the SIP trunking marketplace due to Its simple design and accessibility. The solution gives businesses access to a wide range of advanced VOIP features including call routing, IVR, call recording, time of day rules and disaster recovery.

Our SIP product is seamlessly integrated into the Number Manager platform. This means that existing Invosys partners can make SIP a part of their product portfolio instantly. For resellers taking their first step into VOIP with SIP, the integration of the product into the Number Manager platform means that they can easily add more of the Invosys product suite to their portfolio at a later date.

SIP trunking

Invosys Number Manager 

Add Invosys SIP to Your Portfolio 

For further information on how to get started selling SIP, send an email to [email protected] If you are already an Invosys reseller and you want to make SIP a part of your existing portfolio, contact your account manager for more details.

References: [1] SIP.US   |   [2] The Statistics Portal   |   [3] BT Wholesale – SIP Trunking

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