[RTPproxy Users] Performance (Delay / Jitter)

[Tavis P.]

One possible explanation for the relatively high number of packets to 
unknown port count is a natural one
If one side sends a BYE message through, OpenSER will terminate the 
RTPProxy session causing the sockets for the session to be closed
It could take several hundred (or more) milliseconds before the endpoint 
receives the BYE message and actually stops sending RTP data, during 
this time they are going to be sending their RTP data to a port that no 
longer has any open sockets

This would cause that counter to increase, but it is entirely natural 
given the way that RTP proxying and SIP work (and would have no negative 
effects, besides a bunch of ICMP port unreachables being sent out)

Ronald Voermans wrote:
> Maksym,
>
> Sorry to bother you once more with something that has apparently nothing to do with RTPProxy. I've been googling all week to find an answer as to why the 'packets to unknown port received' increases this fast. I can't however find a answer for it...
>
> I can guess what it means (it receives a packets for which there's no appliation running), but the only thing that's running on the server is openser/rtpproxy/mysql.
>
> Do you perhaps know if I can monitor these packets via a simple command? The complaints of our customers are getting bigger every day, and I have to come up with a solution this week!
>
> Thanks in advance,
>
> Regards,
> Ronald
> -----Oorspronkelijk bericht-----
> Van: users-bounces at rtpproxy.org [mailto:users-bounces at rtpproxy.org] Namens Maxim Sobolev
> Verzonden: dinsdag 24 juni 2008 17:25
> Aan: RTPproxy Users
> Onderwerp: Re: [RTPproxy Users] Performance (Delay / Jitter)
>
> Ronald Voermans wrote:
>   
>> Maksym,
>>
>> Thank you for your answer. I'll try it tonight when the load on the proxy is low.
>>
>> Could this also be the reason for the relative high number of 'packets to unknown port received' when issuing a 'netstat -us':
>>
>> netstat -us
>> Udp:
>>     3590520622 packets received
>>     3397618 packets to unknown port received.
>>     4074 packet receive errors
>>     3601109676 packets sent
>>
>>
>> This number is increasing relatively fast. I don't know how I can make sure that these packets are RTP packets. I think that these packets will be dropped (which CAN cause the jitter/dropped calls towards the ITSP).
>>     
>
> Not quite, the counter you are looking for (dropped packets) is "packet
> receive errors". As you can see, the amount is quite low. Packets to
> unknown port is unlikely yo be related to quality issues.
>
> Regards,
> --
> Maksym Sobolyev
> Sippy Software, Inc.
> Internet Telephony (VoIP) Experts
> T/F: +1-646-651-1110
> Web: http://www.sippysoft.com
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