• Sigma Telecom


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  • VoIP Disconnect Codes – Sip 404 – Sip 403 – The Reasons and Solutions

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We Are

Sigma Telecom. Founded in 2003 to provide advanced telecommunication infrastructure services including; optimization, planning and drive testing.

We Do

High quality and exclusive voice and SMS service; provided by our team of experts. Alongside software and mobile solutions; for both iOS and Android platforms.

We Achieved

Connections with over 500 companies globally, 400M+ minutes of voice carried per month, recognized amongst the biggest mobile operators in Turkey and a sector member of International Telecommunication Union (ITU).

Indispensable Values That Describe Us



At Sigma, we have a fully dedicated, self-motivated, multi-national team. Hailing from all around the world; bringing new cultures and points of view to our company. This diversity allows us to see things from a wider perspective.

Being A Lifetime Learner

For a Sigma employee, learning is a process that never ends. We know that we have a lot to learn from our partners and each other about business and life itself. For this reason, Sigma Telecom invests in its employees' education to improve its talents and promote lifelong learning.


We gain from the combination of our unique diversity and education which leads to our irresistible passion for innovation. We love to use advanced approaches and focus on a variety of aspects to create modern and exciting projects.


We are fair to our employees, business partners and customers. We care about the relationships that we have. This formula has allowed Sigma Telecom to make long lasting and mutually beneficial business partnerships.


Services that 100% guarantee reliable and lucrative partnerships lead to absolute success. We provide first class telecom services, with 24/7 NOC support. Our added value & continuous support deliver a great experience for our partners and we love to exceed these expectations.

We are connected with 500+ companies globally

Some Of Our Partners

And many more!

We are everywhere. Meet us!

Latest Events

Wholesale World Congress'19
Capacity North America'19
GCCM Latam'19
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The Blog

Voip Conference - MWC Los Angeles - Capacity London - GCCM Oman - - Africacom Cape Town - GCCM Cape Town

VoIP Events of the Last Quarter in 2019

We are in the last quarter of the year and 2019 is almost about to finish. We already can say 2019 was very lucrative and beneficial for both the VoIP

Voip Disconnect Codes - Sip 403 - Sip 404

VoIP Disconnect Codes – Sip 404 – Sip 403 – The Reasons and Solutions

Welcome to the master class of VoIP business and today's lecture is about Sip disconnect codes: Sip 404 Not Found and Sip 403 Forbidden. To lower the PDD of the

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Call Flow Diagram – Screen Detailed Analysis for VoIP

Welcome to the master class of Sigma Telecom and today we are going to take a picture of a call and try to tell you about the flow of a

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CDR Monitoring (Call Detail Record) Screen Details

When you are monitoring a VoIP traffic, CDR (Call Detail Record) screen is one of your best friends, helping you by showing what's going on! You can track the rates

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Type of VoIP Sip Codes – Timeout – SIP 408 – SIP 504

If you are looking for a solution for the Sip Codes and errors about a VoIP Traffic, then you are on the right route. Welcome to the VoIP Guide of

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5G Wireless Revenues will reach $4.2 Billion in 2020

According to the global research and advisory research company Gartner, in worldwide aspect, 5G wireless revenues are going to reach $4.2bn until 2020 which means doubling the past revenue.  A

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5G Users Reached 1 Million in 140 Days!

While intensive discussions 5G continues, SK Telecom announced that they have reached 1 million 5th generation wireless network subscribers in only 140 days. SK Telecom has generally 28 million users

SIP-487 Request Terminated – Sip Error Codes

Welcome to the VoIP class and today's topic is the Sip-487 error code. We'll learn the reasons for getting this error code and the ways for fixing the issue. Take