N900 VOIP / SIP lags, choppy, metalic voice / codec problems
 

Hi,
I got a N900 with power Kernel installed.

Since the phone is kind of dead on the development side I plan on using it as a SIP Phone.
The problem is now that I can not get it to work probably.
Even with Skype its just choppy and not really usable.
As a SIP Phone my voice sounds like I am Darth Vader.
When I get called the caller is also choppy.
If I call the called person hears Vader and I have no problem understanding the called person.

The Router is a AVM Fritzbox 7490.
My provider is T-Online.
My N9 works flawless but keeping the Wifi alive is not an option since it drains the battery.
The number I am using is a landline number hence switching the Wifi off is not really feasable.
With the N900 I would just leave it pluged in all the time.

I played around with jitsy as SIP software.
There the same problem arises.
From what I was able to find there seems to be a problem with the Codec (e.g. G722).
It seems that there is a compability issue how the Fritzbox handles the codecs. If the device or the software chooses the wrong one the phenomena I described surfaces.

Is there a way to influence which codec the N900 uses?
Did anyone manage to use the N900 as a SIP relaibly?

Thx

Re: N900 VOIP / SIP lags, choppy, metalic voice / codec problems
 

I am sure you know this thread? But not sure if it helps you.
My SIP experiences are also not that good [but never have been with any wlan device].

Re: N900 VOIP / SIP lags, choppy, metalic voice / codec problems
 

Hi,
thx. I missed that one.
Hmm they recommend a different Wifi driver.
+ fix the frequency of the cpu
+ some people use different codecs

I will play around alittle.
I hope the codec is the culprit.
Thats what messes up the SIP call with Jitsi.

Not sure if the driver is still save to use since its probably based on a outdatet kernel
http://david.gnedt.eu/blog/wl1251/

Re: N900 VOIP / SIP lags, choppy, metalic voice / codec problems
 

It is safe to use.
And if you already use power kernel (latest version kp53) you got thos wlan drivers included as extra modules. Just search kor kp53 and bleeding edge driver.