Sender Restart Indicator

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2020-08-06

Intelligent Indicators

Sender Restart Indicator – when sloppy senders meet picky receivers

Do you know why the RTP header has a sequence number? It is incremented packet by packet and is used to detect packet loss. If your phone detects a gap in the increasing sequence, then it knows that packets were lost along the way.

But what if the sequence number suddenly jumps back to 0? Doesn’t sound like a big issue? Well, it can be and has caused huge customers to suffer from one‐way audio. The reason is that the RTP standard does not define what to do if the sequence number unexpectedly decreases. Due to this, your phone may decide not to play out audio from packets with “funny” sequence numbers. All packets arrive – still there is silence.

Voipfuture Qrystal calculates hundreds of metrics and indicators for every stream in the network and for every 5 seconds in real-time. One is called “Sender Restart”. When needed, it makes life a lot easier for operations engineers.

 

Take care,

Carsten

SIA – more than a million calls per week

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2020-07-08

SIA – more than a million calls per week

Hi all,

 

In my last post about the SIA (SDP in ACK) I said that the problem doesn’t come up that often. The question remained open: What does “not that often” mean?

The screenshot shows two things. Firstly, the problem is minor in percentage terms. On the other hand: In this case, more than a million calls per week are affected.

If the problem is regionally concentrated, the operations team definitely should know about it.

 

Take care,

Carsten

SIA Indicator

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Intelligent indicators

2020-06-23

Cut! The SIA indicator, media interworking and call clipping

You surely have experienced this: You call a friend, ringing stops and then there is silence. You say “Hello…?” and immediately your friend responds with “Yes, I’m here, I already said hello!”.

You missed that first “Hello” from your friend which caused an awkward moment.

Why’s that? When you initiate a call, the endpoints will use to the SDP protocol to negotiate which codec to use. Sometimes this negotiation is still ongoing, when the call gets connected. In effect, the endpoints do not know which codec to use & to expect and the first second(s) of speech are clipped.

 

Voipfuture Qrystal has a special indicator to automatically detect such clipped calls. It’s called “SDP in ACK” or SIA for short. There are call routing scenarios, e.g. involving back-to-back SIP user agents, where the late end of codec negotiation cannot be avoided, and where it’s technically perfectly legal.

 

However, to the users the clipping effect is a nuisance. You want to know how often it happens and want to eliminate it wherever possible. Qrystal’s SIA indicator is here to help.

Take care, Carsten

Just in case you want to know more:

carsten.niepmann@voipfuture.com

How to improve VoIP Monitoring with Media KPIs

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How to improve VoIP Monitoring with Media KPIs

LIVE WEBINAR
Tuesday, June 30, 2020 – 2:00pm ET | 11:00am PT

Quality of service is high on the agenda of VoIP service providers. Many KPIs for measuring the signaling performance exist, but with voice you also have to look for the in-call user experience. Typically, we measure packet loss, jitter and the ominous “MOS” for each call.

Unfortunately, this data will very often not match the experience of actual users.

This webinar discusses how a new generation of Media KPIs can improve VoIP monitoring. These KPIs are already being used today by tier-1 communication service providers around the world to monitor the media plane quality.

What Attendees will learn:

  • Why MOS per call is misleading: The need for new KPIs to measure the in-call user experience
  • How RTP timeslicing provides essential insights
  • Big data: aggregation and slicing of user experience information
  • Examples of VoIP & VoLTE service quality reports using timeslice KPIs

Who should attend:

  • Telecom Engineers
  • VoIP service/network operations & optimization
  • Decision makers with technical background assessing state-of-the-art tools

#telecom #voip #telecomengineer #servicequality #transportquality #kpi

Registration Page

Objective:

Engagement

  • Visit TMC registration page – click on link
  • Create follower – click follower button

 

New Webinar: How to improve VoIP Monitoring with Media KPIs
Tuesday, June 30, 2020 – 2:00pm ET | 11:00am PT

 

Quality of service is high on the agenda of VoIP service providers. Many KPIs for measuring the signaling performance exist, but with voice you also have to look for the in-call user experience. Typically, we measure packet loss, jitter and the ominous “MOS” for each call.

Unfortunately, this data will very often not match the experience of actual users.

 

This webinar discusses how a new generation of Media KPIs can improve VoIP monitoring. These KPIs are already being used today by tier-1 communication service providers around the world to monitor the media plane quality.

 

What Attendees will learn:

  • Why MOS per call is misleading: The need for new KPIs to measure the in-call user experience
  • How RTP timeslicing provides essential insights
  • Big data: aggregation and slicing of user experience information
  • Examples of VoIP & VoLTE service quality reports using timeslice KPIs

 

Who should attend:

  • Telecom Engineers
  • VoIP service/network operations & optimization
  • Decision makers with technical background assessing state-of-the-art tools

 

#Telecommunications #VoIP #Quality #NANO #Network #Operations

Some more on the Network Overload Indicator

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Some more on the Network Overload Indicator

Another short post about the Network Overload Indicator. Because the question arose how it looks exactly in Voipfuture’s Qrystal, here is a short screenshot for those who are not familiar with it.

Of course, this is just a short extract from our pretty long list of indicators. But I think the principle becomes clear.

All automatic indicators tell you:

  • What is the problem
  • And how big is it

You can see how much traffic there is in a selected period. The individual indicators show which impairments there are. In this case it is the network overload indicator and the related jitter.

It is shown as absolute values, as ratio of minutes and you can select which indicators to plot in a chart. And as always with Qrystal, there is a click-through to get to the bottom of it.

If you want to know more or a short life demo – a short email is enough.

Stay sane,

Carsten

How to detect Network Overload

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How to detect Network Overload

Recently we spoke about increasing voice traffic due to Corona and mentioned the network overload indicator. This has led to inquiries, which we are happy to answer this time.

It is important to measure jitter of voice traffic – excessive jitter cannot be compensated for by the receiver and causes gaps in the audio. But what is the reason for a specific jitter event and how do you prevent jitter from happening?

One common source of jitter in the network is buffering. Overloaded network elements like routers and SBCs may be too busy to forward packets in time and start queueing up packets. This creates a very unique pattern in the packet delays of affected RTP streams.

The pattern is automatically detected by Qrystal and flagged by the Network Overload indicator.

The recent increase in call volume due to the Corona crisis underlines the importance of this indicator. Most subscribers won’t notice yet, but the rising traffic is pushing some networks to their limit and eventually the user experience will suffer. Qrystal’s Network Overload indicator will give you the extra time needed to identify bottlenecks and increase network capacity.

More? Just drop me an email.

Stay sane, Carsten

carsten.niepmann@voipfuture.com

Corona Impact on Telecoms

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Corona Impact on Telecoms

“Physical distancing” is key to slowing the spread of the Corona virus and people turn to the phone to stay in touch with colleagues, family and friends. This trend is clearly visible in communication networks – for example, a European tier-1 operator sees roughly 40% more call attempts and almost 50% longer call durations compared to beginning of the year. This trend puts networks to the test. Today’s graphic shows: The network overload ratio is also climbing, i.e. the amount of buffering in routers and other network elements.

I hope you’re well. Stay safe,

Carsten

New IEEE Paper on Call Length and VoIP Quality

IEEE Xplore just published an article on the analysis of the Dependency of Call Duration on the Quality of VoIP Calls”.

The objective of the paper is to examine the dependency between average call duration and call quality as perceived by the user.

 

Authors: Jan Holub, Michael Wallbaum (Voipfuture), Noah Smith, and Hakob Avetisyan

Download

Corporate Identity

Corporate Identity

New logo underscores Voipfuture’s commitment to quality of packet flow

 

Voipfuture, one of the world’s most innovative monitoring companies, introduced a new logo that reflects the company’s heritage and commitment to media quality and an excellent user experience in the field of telecommunication.

The new logo signals the importance of the flow quality of IP packets to the Voipfuture’s technological core competence.

It will impact all visual aspects of how Voipfuture presents itself, from company communications to website. While rooted in Voipfuture’s heritage, the logo reflects a modern, approachable look and the company’s openness for continuous innovation in the transforming landscape of telecommunication.

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