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Edit File: Net::SIP::Endpoint::Context.3pm

.\" Automatically generated by Pod::Man 4.14 (Pod::Simple 3.42) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. 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Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" ======================================================================== .\" .IX Title "Net::SIP::Endpoint::Context 3pm" .TH Net::SIP::Endpoint::Context 3pm "2021-05-04" "perl v5.34.0" "User Contributed Perl Documentation" .\" For nroff, turn off justification. Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" Net::SIP::Endpoint::Context \- Call context for endpoint .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 2 \& my $ctx = Net::SIP::Endpoint::Context\->new( to => .., from => .. ); \& my $request = $ctx\->new_request(..); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" This package manages the call context (from,to,call\-id, recorded routes..) for a call to an Net::SIP::Endpoint. It maintains the state of the current call (local and remote cseq, current state within \s-1INVITE\s0 transaction) and handles requests and responses according to this state. .SH "CONSTRUCTOR" .IX Header "CONSTRUCTOR" .IP "new ( \s-1ARGS\s0 )" 4 .IX Item "new ( ARGS )" \&\s-1ARGS\s0 is either a hash reference or a hash. It contains the following mandatory keys: .RS 4 .IP "from" 8 .IX Item "from" Initiator of call. This is the local address for outgoing calls and the peers address for incoming calls. .IP "to" 8 .IX Item "to" Target of call. .RE .RS 4 .Sp And the following optional keys: .IP "contact" 8 .IX Item "contact" Contact info for context. .IP "incoming" 8 .IX Item "incoming" Flag, if the context resulted from an incoming call. .IP "auth" 8 .IX Item "auth" Authorization info, used if outgoing requests need authorization. See method \fBauthorize\fR in Net::SIP::Request for information on the format. .IP "route" 8 .IX Item "route" \&\e@List of predefined routes (which will be used to create \fBRoute\fR \s-1SIP\s0 header in requests). .IP "via" 8 .IX Item "via" \&\e@List of predefined \fBVia\fR values used in locally generated responses. This is usually set if the context was created by an incoming request from the \fBVia\fR header in the request. .IP "callid" 8 .IX Item "callid" Value of \fBCall-Id\fR header. If not given it will be generated. It's usually given for incoming calls, but not for outgoing calls. .IP "cseq" 8 .IX Item "cseq" Initial local sequence number for the \fBCSeq\fR \s-1SIP\s0 header. Defaults to 0, e.g. the first request will get the sequence number 1. .RE .RS 4 .RE .SH "METHODS" .IX Header "METHODS" .IP "callid" 4 .IX Item "callid" Returns callid of current call. .IP "peer" 4 .IX Item "peer" Returns peer of call. For incoming calls this is the sender, for outgoing calls the recipient of the call. .ie n .IP "new_request ( \s-1METHOD,\s0 [ \s-1BODY,\s0 %ARGS ] )" 4 .el .IP "new_request ( \s-1METHOD,\s0 [ \s-1BODY,\s0 \f(CW%ARGS\fR ] )" 4 .IX Item "new_request ( METHOD, [ BODY, %ARGS ] )" Creates a new requests for method \s-1METHOD\s0 with body \s-1BODY\s0 and additional \&\s-1SIP\s0 headers defined by \f(CW%ARGS\fR. The headers for \f(CW\*(C`to\*(C'\fR, \f(CW\*(C`from\*(C'\fR, \f(CW\*(C`contact\*(C'\fR, \&\f(CW\*(C`route\*(C'\fR will be created from the call context info in \f(CW$self\fR. .Sp One special \s-1ARGS\s0 can be \fBresp40x\fR which should point to a 401/407 \s-1SIP\s0 response containing the offer from the server for authorization. This way authorization can be fully controlled, e.g. first trying w/o authorization and then retrying with authorization credentials and the 40x response. .Sp \&\s-1METHOD\s0 might be already a Net::SIP::Request object in which case it will be used unmodified. \s-1BODY\s0 might be a string or object (see constructor of Net::SIP::Request). .Sp It will add the request to the list of active transactions within the context \f(CW$self\fR, e.g. will be prepared to get responses for it. The callback for the transaction is copied from the default callback for the context, so that it stays the same, even if the default callback changes. .Sp It returns the created request object. .ie n .IP "find_outstanding_requests ( %FILTER )" 4 .el .IP "find_outstanding_requests ( \f(CW%FILTER\fR )" 4 .IX Item "find_outstanding_requests ( %FILTER )" Returns list of outstanding requests (e.g \s-1INVITE\s0 w/o reply) for this context. Returns a list of outstanding request (Net::SIP::Request objects) with the most recent requests first. .Sp \&\s-1FILTER\s0 might be used to restrict the search. With key \fBrequest\fR a Net::SIP::Request object is expected and it will restrict the search to this object (e.g. it will return the object if it is outstanding). With key \&\fBmethod\fR a method can be specified and only requests with this method will be returned. .IP "set_callback ( \s-1CALLBACK\s0 )" 4 .IX Item "set_callback ( CALLBACK )" Sets callback for context, which will be used if the upper layer need to be notified, e.g on incoming requests or an permanent delivery errors. \&\s-1CALLBACK\s0 is a callback usable by \fBinvoke_callback\fR in Net::SIP::Util and will be invoked with the following arguments (some arguments make only sense for incoming packets). .RS 4 .IP "\s-1CTX\s0" 8 .IX Item "CTX" The call context, e.g. \f(CW$self\fR. .IP "\s-1ENDPOINT\s0" 8 .IX Item "ENDPOINT" The Net::SIP::Endpoint object managing \s-1CTX.\s0 .IP "\s-1ERROR\s0" 8 .IX Item "ERROR" The errno of the error occurred ( undef or 0 if no error ). These are the same numbers defined in Errno, but they are usually not set by a system call, but by the dispatcher (like \s-1ETIMEDOUT\s0 if delivery failed permanently after none of the retransmits succeeded or \s-1EHOSTUNREACH\s0 if it cannot resolve the \s-1SIP URI\s0). .IP "\s-1CODE\s0" 8 .IX Item "CODE" This is the response \s-1CODE\s0 from an incoming response packet. Undef if the incoming packet was no response. .IP "\s-1PACKET\s0" 8 .IX Item "PACKET" This is the packet which caused the callback. Only for incoming packets. .IP "\s-1LEG\s0" 8 .IX Item "LEG" Net::SIP::Leg where the packet came in. .IP "\s-1FROM\s0" 8 .IX Item "FROM" \&\f(CW"ip:port"\fR of sender of incoming packet. .RE .RS 4 .RE .IP "request_delivery_done ( \s-1ENDPOINT, TID, ERROR\s0 )" 4 .IX Item "request_delivery_done ( ENDPOINT, TID, ERROR )" Callback setup at delivery of the packet and called with \&\s-1ERROR FALSE\s0 if the packet was delivered successfully over a reliable transport or with \s-1ERROR\s0 an errno if the packet could not be delivered (or no reply came in for packet, so one can assume that the recipient did not get it). .Sp For details on \s-1ERROR\s0 see \fBset_callback\fR. .Sp \&\s-1TID\s0 is the transaction \s-1ID,\s0 see method \fBtid\fR in Net::SIP::Packet. \&\s-1ENDPOINT\s0 is the endpoint managing the context \f(CW$self\fR. .IP "handle_response ( \s-1RESPONSE,LEG,FROM,ENDPOINT\s0 )" 4 .IX Item "handle_response ( RESPONSE,LEG,FROM,ENDPOINT )" Called from the endpoints \fBreceive_response\fR method it handles responses to requests originated from the context \f(CW$self\fR. .Sp \&\s-1RESPONSE\s0 is the response packet, \s-1LEG\s0 the leg where the packet came in and \s-1FROM\s0 the \f(CW"ip:port"\fR of the sender. \s-1ENDPOINT\s0 is the endpoint managing the context \f(CW$self\fR. .Sp First it checks if the response matches an active transaction (which begun its life in \fBnew_request\fR) and if not it drops the response. .Sp Then it checks if the response came in to the right leg, e.g. if the \fBVia\fR header of the packet matches the \fBVia\fR header the leg creates. If not the packet will be dropped. .Sp Then it checks if the method in the \fBCSeq\fR header of the response matches the expected method in the transaction (for INVITEs this could be either \s-1INVITE\s0 or \s-1ACK,\s0 depending on the state of the transaction). If it not matches the packet will be dropped. (All of these packet drops could be observed if you enable debugging, see Net::SIP::Debug. .Sp If the response is for a \s-1BYE\s0 or \s-1CANCEL\s0 request the call will be closed. .Sp If the response is the unsuccessful final response for an \&\s-1INVITE\s0 an \s-1ACK\s0 will be send, if it's preliminary response it will invoke the callback for the transaction. .Sp If the response is a successful final response for an \s-1INVITE\s0 it will save the routes from the \fBRecord-Route\fR header for future requests and create an \s-1ACK\s0 request. The transaction callback will be invoked and gets as an additional argument the created \s-1ACK\s0 request, which then can be modified by the callback. The callback should not send the \s-1ACK\s0 request by itself, it should just modify the given request and sending will be done after the callback returned. .Sp If the response is a successful final response to a request other then \s-1INVITE\s0 it will invoke callback which should fully handle the response. .Sp If the response code is 401 (Unauthorized) or 407 (Proxy Authentication Required) and if the context has authorization info (key \fBauth\fR in the constructor)) it will try to authorize the request based on the realms given in the response and if it can find authorization info for at least parts of the required realms it will redeliver the request. Otherwise it will invoke the callback with an error of \s-1EPERM.\s0 .Sp If the response code is 300 (Multiple Choices) or 301 (moved permanently) it will invoke the callback because it cannot resolve the issue automatically. But if it's 302 (Moved Temporarily) it will rewrite the request based on the \fBContact\fR header in the response and redeliver it automatically. .Sp If the response is 305 (Use Proxy) it will take the information from \fBContact\fR as the upstream proxy and insert it into the routes, so that it will use it as the next hop. Then it rewrites the request for the new routes and redelivers it. .Sp For all other responses the callback will be invoked, e.g the issue has to be resolved by the users application. .IP "handle_request ( \s-1REQUEST,LEG,FROM,ENDPOINT\s0 )" 4 .IX Item "handle_request ( REQUEST,LEG,FROM,ENDPOINT )" Called from the endpoints \fBreceive_request\fR method it handles incoming requests for call context \f(CW$self\fR. .Sp \&\s-1REQUEST\s0 is the request packet, \s-1LEG\s0 the leg where the packet came in and \s-1FROM\s0 the \f(CW"ip:port"\fR of the sender. \s-1ENDPOINT\s0 is the endpoint managing the context \f(CW$self\fR. .Sp First it checks if the sequence number of the incoming request (\fBCSeq\fR header) is not lower then the sequence number of the last request received. Otherwise it will drop the request. .Sp The it checks if the sequence number is the same as for the last request. If it is higher it must be a new request, otherwise it is a retransmit or an \s-1ACK\s0 or \s-1CANCEL\s0 to an \s-1INVITE\s0 request. If it's a retransmit it will be dropped. .Sp If the incoming request is an \s-1INVITE\s0 it will automatically deliver a response \f(CW\*(C`100 Trying\*(C'\fR and then invoke the callback, so that the application might issue \f(CW\*(C`180 Ringing\*(C'\fR responses and finally a final response, like \f(CW\*(C`200 Ok\*(C'\fR. .Sp If the incoming request is \s-1CANCEL\s0 or \s-1BYE\s0 it will issue a response \f(CW\*(C`200 Closing\*(C'\fR and close the context. .Sp All other requests must be handled by the application, e.g. the callback will be invoked.