NAME

       Net::SIP::Endpoint - Endpoint for SIP packets (UAC,UAS)

SYNOPSIS

         my $disp = Net::SIP::Dispatcher->new(...);
         my $ua = Net::SIP::Endpoint->new($disp);
         $ua->register(
               from => 'sip:me@example.com',
               contact => 'sip:me@192.168.0.1',
               registrar => '192.168.0.10:5060'
         );

DESCRIPTION

       The package implements a communication endpoint for SIP.  This is usually a phone, but can
       also be a stateful proxy (because it retransmits packets itself).

       It provides methods to send arbitrary requests but also for sending special requests like
       INVITE or REGISTER. Together with Net::SIP::Endpoint::Context it implements the behavior
       of the endpoint.

       For incoming requests the endpoint usually communicates with the upper layer, the
       application, which is the interface to the user (e.g. let it ring for incoming calls,
       create response for call accepted if user picks up phone on incoming call etc).

CONSTRUCTOR

       new ( DISPATCHER )
           Creates a new endpoint and sets it as the receiver for incoming packets at the
           Net::SIP::Dispatcher DISPATCHER. The endpoint will use DISPATCHER for outgoing packets
           and will receive incoming packets from it.

METHODS

       set_application ( APP )
           Sets APP as the upper layer, e.g. the layer between the user and the endpoint object
           $self. APP is either an object which has a method receive or a callback usable by
           invoke_callback in Net::SIP::Util.

           The callback will be invoked with the following arguments:

           ENDPOINT
                   This is the endpoint itself, e.g. $self.

           CTX     The Net::SIP::Endpoint::Context object for the current call.

           REQUEST The Net::SIP::Request which caused the invocation of the call, e.g. an INVITE
                   on new calls, ACK if the peer established the call, BYE if a call gets closed
                   by the peer etc.

           LEG     The Net::SIP::Leg object where the call came in. Together with FROM used to
                   send response packet back to peer.

           FROM    "ip:port" of the sender of the request.

           It will call into APP in various incoming requests, like:

           INVITE  In this case APP should ring the user and while ringing send "180 Ringing"
                   responses back to the peer, using "ENDPOINT->new_response". After some time it
                   should send a final response (like "200 Ok" if the user accepted the call).

           ACK     This is the sign, that the peer established the call. APP should now expect to
                   process incoming RTP data and send RTP data itself.

           CANCEL, BYE
                   This informs APP, that the call is closed. No need for the APP to send a
                   response itself, this was already handled by the endpoint (because there is no
                   choice of responses, it can hardly not accept a BYE).

           other requests
                   Like OPTION,.. .  Theseneed to be fully handled by APP, e.g. send the
                   appropriate response back using "ENDPOINT->new_response".

       invite ( CTX, [ CALLBACK, BODY, %ARGS ] )
           Creates a new INVITE request and delivers it to the peer.  Simply calls new_request
           with the method 'INVITE'.  See this method for information for the arguments.

       register ( %ARGS )
           Registers endpoint at remote registrar. %ARGS needs to be filled as follows:

           registrar
                   "ip:port" of registrar. Mandatory.

           from    The address to register at the registrar. Mandatory.

           contact The contact, under which "from" will be registered. Mandatory.

           auth    Authorization info, see method authorize in Net::SIP::Request for information
                   about the format. Optional.

           expires Expires time. Optional, defaults to 900.

           callback
                   Optional callback, e.g. called if requests come in from the peer on the call
                   created for the registration. See invoke_callback in Net::SIP::Util for the
                   format.

           All other keys will be used as header keys in generating the Net::SIP::Request object.

       new_request ( METHOD, CTX, [ CALLBACK, BODY, %ARGS ] )
           Method is the uppercase name of the method for which a request should be generated. It
           can also be already a Net::SIP::Request object in which case no new request object
           will be generated, but the provided delivered.

           CTX is either an existing Net::SIP::Endpoint::Context object or a hash reference which
           will be used to construct one. It contains information about "from" and "to" etc. See
           constructor in Net::SIP::Endpoint::Context for details.  In case of a hash reference
           auth and callid from ARGS will be used for the newly constructed context.

           If it is an existing CTX it has to be one which is already managed by this endpoint
           (e.g. one returned by this method), the endpoint will only manage CTX which it created
           itself so that a context cannot be shared between multiple endpoints.

           CALLBACK is a callback usable by invoke_callback in Net::SIP::Util.  If defined it
           will be set up as the new default callback for the context.

           BODY is a string or an object for the SIP body accepted by the constructor of
           Net::SIP::Request.  See there.

           If a response object is given as resp40x in ARGS it will be used to authorize the
           newly created request.

           Anything else in %ARGS will be used to construct the SIP header. See constructor in
           Net::SIP::Request.

           It returns the Net::SIP::Endpoint::Context object for this request which can be then
           used for further requests in the same call.

       cancel_invite ( CTX, REQUEST, CALLBACK )
           Cancel the given request within the given context (e.g send CANCEL request).  If no
           REQUEST is given it will cancel the most recent INVITE. Returns the number of requests
           canceled, e.g. 0 or 1.

           CALLBACK will be used as the callback for the CANCEL request it sends using
           new_request.

       close_context ( CTX )
           Delete Net::SIP::Endpoint::Context object CTX from the list of active calls.

       receive ( PACKET, LEG, FROM )
           Called from dispatcher on incoming packets.

           PACKET is the incoming Net::SIP::Packet, LEG the Net::SIP::Leg where the packet came
           in and FROM the "ip:port" of the sender.

           Just forwards to receive_request or receive_response based on the type of packet.

       receive_response ( RESPONSE, LEG, FROM )
           Handles incoming response packets. Tries to find an active call based on the "Call-Id"
           header in the packet. If none was found it will drop the packet, otherwise call
           handle_response on the call context object (Net::SIP::Endpoint::Context).

       receive_request ( REQUEST, LEG, FROM )
           Handles incoming requests.

           If there is already a call context for this Call-Id in the request it will use it,
           otherwise it will create a Net::SIP::Endpoint::Context object based on the information
           in the request ("from", "to", "contact",... ).

           Calls handle_request on the existing/new context object.

       new_response ( CTX, RESPONSE, LEG, ADDR )
           Delivers Net::SIP::Response packet RESPONSE through the endpoints dispatcher to ADDR
           ("ip:port") using Net::SIP::Leg LEG.  LEG and ADDR are usually the leg and the senders
           address where the associated request came in.

           CTX is the context from the call, where the associated request came in.

           If the response is a 2xx response to a INVITE and no "contact" header is given as
           required from the RFC it will add one based on the CTX.