Chat with us, powered by LiveChat

FIFA 1 – VoIP 0 – Consider the Five most likely causes of poor VoIP Calls

By June 25, 2014 Voip

FIFA is here…

It is the time of year when staff and officers of companies unite to watch the game… in the office… on multiple computers, all streaming in high definition.

Here where today’s standings:

fifascores

 

 

 

 

 

 

 

 

 

 

 

 

 

There are usually complaints.. .many of them during these events. The strain on internal networks, in particular those dependent on VoIP sets or SIP trunk providers are at their peak during these types of events.

A bit of a background. You already may know that we are strong advocates of running VoIP on a private network. (or what we call Voice over Private Network).

A few of our past stories can be found here:

Firms who sell SIP Trunking should be licensed – Here is why

Size of a Voip Call … and why VoIP can go ‘boom’

Reliability of Voice over IP

In this piece, we are not so much talking about the actual WAN or wide area network, moreso just the general’ causes for VoIP failure.

Ever wonder what bad VoIP sounds like?

Synthetic Voice Symptom Recording

Symptom—The term synthetic means that the sound of the voice is artificial and with a quiver or fuzz. Predictive insertion causes this synthetic sound by replacing the sound lost when a packet is dropped with a best guess from a previous sample. Synthetic and choppy commonly occur together.

Cause—A common cause is single packet loss or delay beyond the bounds of the de-jitter buffer playout period. DSP predictive insertion causes the synthetic quality of the voice. For example, when a call is provided insufficient bandwidth (such as G711 codec across 64Kbps).

How do you fix this? Or how do you avoid this? Consider the Five most likely causes of poor VoIP Calls

1. Jitter

Jitter is a common problem of the connectionless networks or packet switched networks. Because the information (voice packets) is divided into packets, each packet can travel by a different path from the sender to the receiver. When packets arrive at their intended destination in a different order then they were originally sent, the result is a call with poor or scrambled audio.

The Solution: Use Jitter Buffers

2. Latency

VoIP delay or latency is characterized as the amount of time it takes for speech to exit the speaker’s mouth and reach the listener’s ear. Latency sounds like an echo.

The Solution: Prioritize

3. Poor Internet Connection

Most ISP’s are designed for web surfing and not VoIP advantages. Transporting voice packets is different and requires an additional set of internet protocols that your ISP may not be providing.

The Solution: Business Class High Speed connection or MPLS like what is provided by Frontier Networks.

4. Inadequate Router

Bad equipment is bad equipment.

The Solution: Install a Specialized VoIP Router

5. Internal Network Improperly Configured

VoIP is less than 10-years old. Many companies do not consider the higher quality demands of VoIP communications. If your company decides to route both voice and data over the same network without properly configuring your network for VoIP traffic, you can expect to have call quality issues.

The Solution: Network Configuration

If you want to listed to some more examples – check these out. It is a pretty neat summary.

fuzzy voice symptoms

Symptom—Fuzzy voice sounds similar to a radio that is turned up too loud. This might only occur at certain signal levels within the sentence.

Cause—This is often caused by too much gain on the signal, possibly introduced at one of a number of points in the network.

Muffled voice

Symptom—Muffled voice sounds similar to when you speak with your hand over your mouth.

Cause—A common cause is an overdriven signal or some other cause that eliminates or reduces signal level at frequencies inside the key range for voice (between 440 and 3500).

Tinny voice symptoms

Symptom—Tinny voice is similar to when you listen to an old-fashioned wireless broadcast.

Cause—A common cause is an overdriven signal, or some other cause that eliminates or reduces signal level at frequencies outside the key range for voice (less than 440 and greater than 3500) but important to the richness of the voice.

Loud Voice Symptom Recording

Symptom—During the discussion the volume or tone of voice elevates loudly.

Cause—Loud voice is usually caused by too much gain on the signal, possibly introduced at one of a number of points in the network. For example, the signal can be overdriven from the PBX. This is the same as fuzzy voice, but the distortion is not perceived.

Fluctuating Voice Symptom Recording

Symptom—A fluctuating voice is when the volume of the voice increases and decreases in a wave fashion.

Cause—A common cause is a vendor bug with an IP telephone load. The workaround for this problem is to switch to the speaker and back.

Duck Quack Symptom Recording

Symptom—You hear the sound of a duck during a call.

Cause—We are just having fun with you – duck sound is not a VoIP impairment. But if you hear a duck don’t be alarmed.

Unintelligible Underwater Voice Symptom Recording

Symptom—Unintelligible underwater voice describes a distortion that makes it impossible to understand the voice. Descriptions of this sound include the sound of a cassette tape fast forwarded, a gulp sound, and a wishy-washy sound.

Cause—A common cause of this problem is a codec mismatch.

Synthetic Voice Symptom Recording

Symptom—The term synthetic means that the sound of the voice is artificial and with a quiver or fuzz.

Cause—A common cause is single packet loss or delay beyond the bounds of the de-jitter buffer play out period specifically when a call is provided insufficient bandwidth (such as G711 codec across 64Kbps).

Robotic Voice Symptom Recording

Symptom—Robotic voice and synthetic voice are interchangeable.

Cause—This is covered by major vendors as a ‘bug’ with various software updates to remedy this.

Severe Static Symptom Recording

Symptom—Severe static is an example of static that, in addition to creating background noise, affects the dial and ring tones and the voice itself. Another name for this symptom might be scratchy or gravel voice.

Cause—A common cause is again codec mismatch.

Crackling Symptom Recording

Symptom—Crackling is an irregular form of very light static, similar to the sound a fire makes.

Cause—A common cause is poor electrical connections, in particular poor cable connections. Other causes are electrical interference and a defective power supply on the phone.

Clicking Symptom Recording

Symptom—Clicking is an external sound similar to a knock that is inserted usually at intervals.

Cause—Clock slips or other digital errors are common causes.

Remember, at Frontier, we are data and voice people For the voice side we are only VoIP… we know it well and know how to attack this stuff. When operating on our private, voice enhanced broadband, we don’t seem to have these issue.

 

1-866-833-2323 sales@frontiernetworks.ca