[Serusers] Xlite not working with SER+SEMS

Pat wang wangyu39 at hotmail.com
Tue Aug 2 13:09:11 CEST 2005

Hi Stefan,

Thanks for your reply. Actually the Xlite was in the same LAN as SER/SEMS 
when I met that problem. Yes, following what you said I noticed the ICMP 
unreachable is for the RTCP but not RTP.  I just tried another test by 
moving Xlite behind a NAT. It works this time.
I am running SER as root. I'll try to run it on different user then move 
Xlite back to the same LAN with SER and see what happens. Thanks for you 


>From: Stefan Sayer <sayer at fokus.fraunhofer.de>
>To: yu wang <wangyu39 at hotmail.com>
>CC: serusers at lists.iptel.org
>Subject: Re: [Serusers] Xlite not working with SER+SEMS
>Date: Tue, 02 Aug 2005 10:51:23 +0200
>usually xlite listens to the rtp port. Are you sure that the ICMP messages 
>come from the client and you set up the firewall on the client correctly?
>sems does not support rtcp, so when xlite sends rtcp reports, there is an 
>icmp coming back from sems to the client.
>If you look at sems log you can see whether the icmp watcher ends the 
>session, if this is the case try starting sems as non root user to disable 
>the icmp watcher, but i doubt that this will make a difference.
>yu wang wrote:
>>I've been working on conference with Xlite but it is not work. The problem 
>>is SEMS starts sending media (default wav) back to Xlite once SEMS 
>>receives the INVITE/SDP from Xlite. It seems a bug on Xlite not listening 
>>on the media port after sending the INVITE thus it replys with ICMP port 
>>unreachable. But I don't see anyone complain this on this list. Is 
>>something wrong with my configuration?
>>Please please help me.... Thanks,
>>Serusers mailing list
>>serusers at lists.iptel.org

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