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 => 'sip: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: Hash with information about the sender of the request (keys "proto", "addr", "host", "port" and "family")

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: SIP URI of registrar, i.e. anything acceptable to sip_uri2parts from Net::SIP::Util. 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 hash with the sender info.

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 (hash) 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.