[asterisk-users] Tired of dropouts and garbled phone calls - where to go next?

[Ron Wheeler]

On 28/10/2013 4:12 PM, Mark Wiater wrote:
>
> On 10/28/2013 3:59 PM, Ron Wheeler said:
>> I am reaching the same level of frustration.
>> I have tried to find the source of the problems.
>> We have IAX2 to our VoIP provider and SIP phones attached to the 
>> Asterisk - No analogue.
> I don't have any problems with IAX, but I hear some do.
I have now switched to SIP and will check the quality in the morning.
>
>> We have a very lightly loaded 60 Mbs cable link to the Internet that 
>> tests pretty close to that most of the time.
> Bandwidth is less important than the overall quality of the internet 
> link, latency and jitter. Either way, there is no QoS on the internet, 
> all bets are off.
>
> The codec can matter too. What are you using?
G711
>
>>
>> I have not found any good tools to track down the causes of poor 
>> voice quality.
>> In my case, I have good incoming quality and terrible quality going out.
> Oh, is your cable connection assymetric? Upload smaller than download? 
> If so, that correlates to terrible audio, right?
Just ran a test 50 Mbps  download 10Mbps upload. Should be enough I hope.
>
>> That is, I can hear people perfectly well but they complain that my 
>> voice drops out and is garbled regardless of who places the call.
>> As a result,  I use Skype for all of my calls and if someone calls 
>> me, I call them back on Skype if they have any problems.
>> I don't understand why Skype works so well and Asterisk works so 
>> poorly on the same environment.
>>
>> Googling "Asterisk poor audio quality" return several hundred 
>> thousand references
> I'd not shoot asterisk yet. I'd focus on the internet connection and 
> it's components (cable modem) first.
>
Good idea. I am sure that you are right but what to test and how are not 
clear.
> I use asterisk all over the place. Mostly connected to PRI's and 
> Carrier provided SIP trunks, with internet SIP trunks as backup. I get 
> complaints on the Internet based SIP trunks sometimes, never on other 
> other two.
>
> I'd ask most of these questions of the OP too. Overall telephony 
> design matters.
>
>
>


-- 
Ron Wheeler
President
Artifact Software Inc
email: rwheeler at artifact-software.com
skype: ronaldmwheeler
phone: 866-970-2435, ext 102

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