Wednesday, June 18, 2008

My WiMAX Experiment - Part 4: VoIP Call Quality

Part 4 of my WiMAX Experiment deals with VoIP call quality while using the WiMAX Modem. I have placed a few calls to date and have had some great calls, but also some not-so-great calls. It seems to not only be dependant on my modem reception, but also some unknown factors which I could not quantify.

I thought that I would share recordings of some tests that I did to gauge the call quality relative to a cell phone. Note: they look like flash videos, but there is no video - only sound.

Call #1 - Cell phone call to a Vonage voice mail

  • The purpose of this call was to baseline the VoIP call quality relative to a traditional cell call.




Call #2 - Gizmo call via WiMAX to a Vonage voice mail


  • The proof is in the pudding, so-to-speak: my first documented test of a VoIP call with the WiMAX modem.





The VoIP call was a little unclear in spots, but I thought it was feasible, even with the latency and bandwidth I can attain with the WiMAX modem. Those initial tests gave me the courage to record a conversation with someone while connected via the WiMAX modem...

Call #3 - a real life Gizmo call to an InternetTabletTalk member via WiMAX!

  • I cold-called ITT member, qwavel, by sending him a PM on Internet Tablet Talk. Since he had made some comments on my experiment, I wanted to see if he would be interested in participating in a VoIP call with me. He instantly agreed. Since I did not know of an easy way to record the call on the tablet using Gizmo, he offered to record the call on his end via his Nokia N95. Hats off to qwavel for his enthusiasm and helpful conversation!





The interesting observation I had after listening to this recording was that qwavel sounded pretty clear to me at the time of the call, but on the recording, I sounded distant and broken up frequently. If both voices were relaying through the WiMAX modem, why was there such a difference between my observation during the call, and the subsequent recording?

Stay tuned for Part 5 of my WiMAX Experiment, where I will take the show on the road - literally!

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6 comments:

GameGod said...

Is it possible that the microphone's not that good on the n810?

GameGod said...

Just finished listening to the last call, and I'm also curious if the N810 WiMAX Edition will work with Rogers or Bell.

I coincidentally just blogged about this today: http://linuxrevolution.blogspot.com/2008/06/to-iphone-or-not-to-iphone.html

EIPI said...

I was using a Bluetooth headset, but it was used on all 3 recorded calls. My opinion is that the N810WE will work on the current network. Whether Rogers/Bell will allow it to is another matter.

Qole Pejorian said...

Even if you could use the N810WE with the Inukshuk network, you'd lose connection as soon as you tried to move around anywhere... Their pre-WiMAX network is not mobile.

Why don't they upgrade their network to true WiMAX? It can't cost that much, can it?

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