[RTPproxy Users] UDP Port Unreachable

[Tavis P.]

Port unreachables are expected during the teardown phase of a SIP 
dialog, have a look at 
http://lists.rtpproxy.org/pipermail/users/2008-June/000044.html for more 
information
This is probably why you are seeing the ICMP unreachables, otherwise the 
problem is most likely in the last mile (either the subscriber UAC or 
the terminating gateway). 
Most commonly its due to bandwidth exhaustion but you'll have to 
evaluate the issue on a case by case basis

To date i've not had a single call quality issue that has been 
attributed to RTPProxy



Ronald Voermans wrote:
> Hello RTPProxy users,
>
> I'm still experiencing some quality issues with Openser and RTPProxy. Calls sound very choppy sometimes (not always, around 10% of the calls). So, it seems packets are lost, or jitter is pretty high sometimes. I've been running a monitor between our RTPProxy and our ITSP for some weeks now, and I find the following pretty interesting:
>
> I'm seeing a lot of 'ICMP Destination Unreachable (Port Unreachable)', being generated by the OpenSer/RTPProxy. This means, I think, a RTP packet is received by the RTPProxy server but it doesn't 'listen' to the port. This results in a lost packets and thus choppy sound.
>
> The server is dimensioned enough i guess (xeon processor, 4GB memory for around 30 calls concurrent).
>
> What could be the cause of this Port Unreachable message?
>
> Thanks in advance,
>
> Regards,
>
> Ronald
>
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