xfone 018 phone service and Linux

[Gilad Ben-Yossef]

Arie Skliarouk wrote:


>>
>>     How do they solve the latency problems inherent to any internet
>>     connection?
>     The round trip time to a well connected (read: 0% packet loss)
>     server in Israel from an Israeli ISP, where Israel here is defined
>     as "connected to the IIX", is under 50ms.
>
>
> On a 150kbit upload ADSL upload of a 1500 bytes packet takes about 
> 85ms. To send out the VoIP packet would take another 85ms (on 
> condition that you have a really good QoS). This causes latency of 
> 85-170ms with jitter 85ms. The VoIP speech (SIP protocol) has a lot of 
> skips and is unacceptable.
ahem... accept in real life VoIP packets are rarely larger then 250 
bytes (most of the time then are not over 100 byes) and that the SIP 
protocol doesn't actually carry any media (read: voice) information - 
that is left for RTP.

More to the point - VoIP , in general works great. In the (very distant) 
past been on the technical team of a VoIP start up and trust me - VoIP 
works great on ADSL lines.

> Theory aside, I would like to hear first-hand experiences of people 
> with 018 before I commit for a year of phone service with them.
That I agree completely - that fact that VoIP works doesn't means that 
018 do... :-)

Gilad


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