[Asterisk-Users] RFC2833 & firewall problems? (16-byte UDP packets)

[Bryan Field-Elliot]

When watching from the Asterisk server (running tcpdump), the
destination IP address and port number are the same for the conversation
packets and the RFC2833 packets.

But when watching from the SIP client's local LAN (another computer on
the subnet, in promisc mode, running tcpdump), the RFC2833 packets
(length 16) never arrive.

Weird?


On Thu, 2005-06-02 at 13:01 +1200, Matt Riddell wrote:

> Bryan Field-Elliot wrote:
> 
> > The problem is, the other SIP client is never receiving the RFC2833 
> > packets. An ethereal trace on the same local network shows that the 
> > regular conversation UDP packets are coming through just fine (packet 
> > length: 172), but the RFC2833 packets are never received on the SIP 
> > client LAN (though they are sent by the server). RFC2833 UDP packets 
> > appear to be packet length: 16.
> > 
> > Has anyone seeing this kind of behavior, perhaps from firewalls or 
> > otherwise?
> 
> I don't suppose you see the packets go anywhere else?
> 
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