[asterisk-biz] Is ISP Blocking VoIP

[Sergey Kuznetsov]

trixter aka Bret McDanel wrote:
> On Tue, 2006-01-31 at 21:54 -0500, Sergey Kuznetsov wrote:
>   
>> I see the only one way to do it.
>> To make simple test program which will be started on both endpoints.
>> Both boxes do the ntpdate right before the tests.
>> then one box sends and receives the number of rtp packets with 
>> increasing sequence numbers and stores the timestamps in the log
>> the same is done on the second box, it sends and receives from/to the 
>> first box and stores the sequence numbers and timestamps into the log.
>> then they exchanges by the logs, and third perl script compares the 
>> result and shows lost packets and latency for each packet in text or 
>> graphics.
>>     
>
> I think there was something for ethereal that does basically this off
> normal traffic.  Not just RTP but other types which lets you know if its
> networking to/from a specific box or if its protocol based.
>   

Bret,

The problem here that IP packets is not have the timestamp option by
default, as well as RTP packet
delivers only relative not the absolute timestamp.


my method is quite ugly, but gives more precise results.


All the Best!
Sergey