Net::SIP::StatelessProxy(3pm)				User Contributed Perl Documentation			     Net::SIP::StatelessProxy(3pm)

NAME

       Net::SIP::StatelessProxy - Simple implementation of a stateless proxy

SYNOPSIS

       ..

DESCRIPTION

       This package implements a simple stateless SIP proxy.  Basic idea is that the proxy has either a single or two legs and that the packets
       are exchanged between those legs, e.g. packets incoming on one leg will be forwarded through the other leg.

       Because this is a stateless proxy no retransmits will be done by the proxy.

       If the proxy should work as a registrar too it should be put after a Net::SIP::Registrar in a Net::SIP::ReceiveChain.

       While forwarding the proxy will be insert itself into the packet, e.g. it will add Via and Record-Route header while forwarding requests.

       Additionally it will rewrite the Contact header while forwarding packets (see below), e.g. if the Contact header points to some client it
       will rewrite it, so that it points to the proxy and if it already points to the proxy it will rewrite it back so that it again points to
       the client.

CONSTRUCTOR

       new ( %ARGS )
	   Creates a new stateless proxy. With %ARGS the behavior can be influenced:

	   dispatcher
		   The Net::SIP::Dispatcher object managing the proxy.

	   rewrite_contact
		   Callback which is used in rewriting Contact headers.  If one puts user@host in it should rewrite it and if one puts something
		   without '@' it should try to rewrite it back (and return () if it cannot rewrite it back).  A working default implementation is
		   provided.

	   nathelper
		   Optional Net::SIP::NATHelper::* object. When given it will be used to do NAT, e.g. if the incoming and outgoing legs are
		   different it will rewrite the SDP bodies to use local sockets and the nathelper will transfer the RTP data between the local
		   and the original sockets.

	   force_rewrite
		   Usually the contact header will only be rewritten, if the incoming and outgoing leg are different. With this option one can
		   force the rewrite, even if they are the same.

METHODS

       receive ( PACKET, LEG, FROM )
	   PACKET is the incoming packet, LEG is the Net::SIP::Leg where the packet arrived and FROM is the "ip:port" of the sender.

	   Called from the dispatcher on incoming packets. The packet will be rewritten ("Via" and "Record-Route" headers added, Contact modified)
	   and then the packet will be forwarded.

	   For requests it can determine the target of the forwarded packet by looking at the route or if no route it looks at the URI. For
	   responses it looks at the next Via header.

       do_nat ( PACKET, INCOMING_LEG, OUTGOING_LEG )
	   This will be called from receive while forwarding data.  If nathelper is defined it will be used to rewrite SDP bodies and update
	   nathelpers internal states to forward RTP data.

	   Return values are like forward_outgoing in Net::SIP::Leg, e.g.  it will return "[code,text]" on error or "()" on success, where success
	   can be that the packet was rewritten or that there was no need to touch it.

UNDOCUMENTED METHODS

       idside2hash

perl v5.14.2							    2010-02-02					     Net::SIP::StatelessProxy(3pm)