Great question.  I sure don't know the answer.  But you have access to
the source code, and it sounds like you wouldn't have any problem using
Wireshark to capture packets on the other side to find out empirically.
Let us know what you find!


Cheers,
Todd.

> -----Original Message-----
> From: Michael Hirschbichler [mailto:s...@hirschbichler.biz] 
> Sent: Tuesday, October 20, 2009 9:20 AM
> Cc: sipp-users@lists.sourceforge.net
> Subject: Re: [Sipp-users] Understanding RTP in SIPP
> 
> Hi Bradley,
> 
> "inter packet delay" is the delta between arriving of each of 
> the RTP-packets.
> For example, each rtp packet is sent 20ms after the packet 
> before. On B-Party side, the time between the received 
> packets may vary due to network delay - this additional delay 
> is responsible for the jitter.
> 
> My question was: Will on a replayed pcap file the delta 
> between each of the rtp packets be automatically normalized 
> to these 20ms or will it be sent with the delta as reveiced 
> and recorded? Or in other words: is the RTP-timestamp or the 
> time-of-arrival used as time-reference for replaying the stream?
> 
> br
> Michael
> 
> Bradley, Todd wrote:
> > Yes, it'll still have the same jitter.  In other words, if you 
> > captured the packets out of order, they'll still be out of 
> order when 
> > you play them back.  But what does "delay" mean in this 
> example?  The 
> > gap in time between when the packet was sent and when it arrives?  
> > That's going to be days, weeks, or months in this case.
> > 
> > 
> > Cheers,
> > Todd.
> > 
> > -----Original Message-----
> > From: Michael Hirschbichler [mailto:s...@hirschbichler.biz]
> > Sent: Tue 10/20/2009 3:56 AM
> > To: sipp-users@lists.sourceforge.net
> > Subject: [Sipp-users] Understanding RTP in SIPP
> > 
> > Hi all,
> > 
> > I am using a pcap sound sample to be replayed with sipp with
> >   <nop>
> >       <action>
> >         <exec play_pcap_audio="./mediastream.pcap"/>
> >       </action>
> >   </nop>
> > 
> > This media-stream in the pcap-file has some jitter and various 
> > inter-packet-delay. Am I correct in the assumption, that 
> this jitter 
> > and delay will not have any effect on the pcap-replay 
> functionality of sipp?
> > Or will the pcap-file be replayed as is with the same 
> jitter and delay 
> > as in the original trace?
> > 
> > Thanks in advance and best regards
> > Michael
> > 
> > 
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