Required Internet Speed for Obi voip service
Stewart:
AFAIK, the OBiON app is just a signaling protocol converter and has no ability to transcode or otherwise deal with codecs. On an outbound call, whatever codecs are advertised by the softphone are presented to the remote OBi, which will select the first one in the softphone's list that is enabled in the OBi.
Because upstream voice quality issues are much more common than downstream, I suggest that you confirm that the trouble is really at the office end -- if it's at home, a QoS setting in your router may solve it. Try making voice calls from home that don't involve the office, e.g. with Gmail or with your home OBi and GV or a SIP service. Likewise, try some VoIP calls at the office that don't involve your home Internet connection.
If the office connection is the culprit and can't be fixed, a possible alternative is calling via a SIP provider that permits sending your business number as caller ID. Of course, the calls won't be free, but depending on your usage level, they could be half a cent per minute or less.
Ideasmiths:
Thanks Steward....
Well, unfortunately SIP services at this moment is not a feasible solution because there is a company installed hardware/software monitoring system in the office tied to the PSTN lines. The function is to detect Do Not Call numbers and I do not have access to that system. So each call I make has to be 'safe' and pass through the system and out the PSTN line.
I managed to try a softphone that has G729 codec and it works with the Obi Settings. I also tried using my home Obi and it works 'okay' with G711U, so I guess it is the network latency between my home->ISP->Office ISP->Office network->Obi110->PSTN line.
Tried the G729 this morning and the voice quality is just as good as the G726R32 and G711U. I will try to solve the rest of the latency issues progressively. :)
Stewart:
Long latency in a voice path does not directly relate to poor quality, as long as only one party speaks at a time. It does cause trouble in three common situations. If one party interrupts the other, the second party will have spoken several more words before he hears the interruption, causing confusion. This is often compounded by the poor "doubletalk" performance of most VoIP systems. If latency is very long, when a party stops speaking for a moment, he may incorrectly conclude that the other chose not to reply and continue with his next thought. However, if there are also (perhaps unrelated) quality issues, high latency is very frustrating, because when one party asks the other to repeat what wasn't heard, several additional words have already been spoken.
Try this test number: 1-703-376-3246. Initially, you record a message and press #. It's played back for you to check outbound voice quality. Then, use option 3 for the real-time echo test, which will give you a good idea of latency. If it's excessive, there are several ways it might be reduced.
What kind of PBX do you have at the office? If available, a direct IP connection should greatly improve quality. Although expensive, an off-premises extension (ISDN or analog), should get you very close to "in-office" quality.
Ideasmiths:
The IT side is shielded from me, I know there is a PBX somewhere but there is no access to it. I had tried using my own 3cx IPBX before :D. Anyway, I am located in Singapore so the echo test number won't be feasible. I just call my own mobilephone or another landline to find out how the sound is. But the real test is when I speaks to my customers and I can hear their responses.
With G711u, many of them say 'huh?...huh? during the conversation or there are long delays in their responses. I just did a speedtest today and it seem like my up link speed is only max 65Kbps and average 55 Kps. So G711u may be stuttering due to my home uplink. (my company's ISP have faster down/up speed). So I guess G729 is much better at 32Kps and the G726R32 around 55Kps was also good.
I'll give G729 a try coming monday and see how the real test go
Stewart:
Quote from: Ideasmiths on April 28, 2012, 06:59:03 am
I just did a speedtest today and it seem like my up link speed is only max 65Kbps and average 55 Kps.
If you have a "normal" home broadband connection (DSL, cable, or fiber), something is very wrong. For example, even the slowest (6Mbps downstream) service from SingNet advertises 512 kbps upstream. Conservatively, you should get 400 kbps useful (as measured by a speed test).
If you have a wired Internet connection, there could be a problem with your line, modem, or networking equipment. Or, your line might be saturated with unwanted traffic (malware, configuration issue, filesharing in background, neighbors leeching off your unsecured Wi-Fi, etc.) Log into your modem and look at the stats (noise margins, resyncs, retransmissions, total traffic, etc.) Once you get that fixed, you should enjoy excellent quality with G.711 (anything over 100 kbps on a speedtest should be fine, if you refrain from surfing while on the phone).
My apology for being confused by the other (US based) posters in this thread. For an echo test with an SG number, call +65 31581212. This is an iNum gateway. At the "welcome to iNum" prompt, dial 000000091#. The actual echo test server is in Belgium, so latency will be long. However, you can still make valid comparisons; test from your office and measure the delay. Then, test from your softphone through the OBi and your office PBX. The difference between those delays should be very close to the round-trip delay you'll experience when calling an SG customer on his landline.
If you have a wireless connection (cellular data, or fixed wireless), please supply some details. While not ideal for VoIP, it shouldn't be as bad as what you have tested.
I'm fairly close (Bangkok) and just tried speedtest.net, selecting the first Singapore server (Telin). My DSL here is rated at 10Mbps down, 1Mbps up, and was able to saturate the line with that server.
Navigation
[0] Message Index
[#] Next page
[*] Previous page