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README
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README
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RNID SIP STACK
==============
This library of code consists of three main parts:
* a SIP stack (RFC 3261),
* an RTP stack (RFC 3550), and
* SDP (RFC 2327) parsing and utilities.
The code currently implements most of SIP, RTP. The stack can make and
receive calls from/to X-Lite, linphonec. It also connects correctly
with ser, the Sip Express Router.
The stack supports/implements the following RFCs:
* RFC 2327 (SDP: Session Description Protocol)
* RFC 2782 (DNS SRV Resource Record)
* RFC 3261 (SIP: Session Initiation Protocol)
* RFC 3263 (Locating SIP Servers)
* RFC 3264 (An Offer/Answer Model with SDP)
* RFC 3265 (SIP-Specific Event Notification)
* RFC 3266 (Support for IPv6 in SDP)
* RFC 3351 (User Requirements for SIP in support of Deaf, Hard of
Hearing and Speech-impaired Individuals)
* RFC 3403 (DNS NAPTR Resource Record)
* RFC 3420 (Internet Media Type message/sipfrag)
* RFC 3515 (Refer Method)
* RFC 3550 (RTP: A Transport Protocol for Real-Time Applications)
* RFC 3551 (RTP Profile for Audio and Video Conferences)
* RFC 3581 (Symmetric Response Routing)
* RFC 4102 (text/red MIME Sub-Type)
* RFC 4103 (RTP Payload for Text Conversation)
* RFC 4145 (TCP-Based Media Transport in SIP) (Note: the connection
parameter IS NOT yet supported.)
* draft-ietf-sip-gruu-06 (Globally Routable User Agent URIs)
Present, but not completely implemented, are:
* RFC 3891 ("Replaces" Header)
* draft-ietf-sip-target-dialog-01 (Request Authorization through
Dialog Identification in SIP)
The stack uses Indy 9.0.14 (but 9.0.18 should work fine). Find this
excellent library either in your Delphi\Sources\Indy directory or at
http://www.indyproject.org/
Note that Indy doesn't support some functionality that a SIP stack
requires, such as SRV and NAPTR DNS records. In the indy-patches
directory you'll find all patches to the Indy project. You'll have to
merge these changes into your Indy setup.
All test code relies on the DUnit test framework. See
http://dunit.sourceforge.net/ for details.
Of the stuff not implemented, the most important missing bits include:
* S/MIME;
* proxy classes
The main interface to the stack - the interface you want to use to USE
the stack, as opposed to extend the stack - is in
src\IdSipStackInterface.
If you're interested in hacking the stack, take a look at the
SingleCoreSpike class in tests\SingleCoreSpike.pas. It illustrates, in
a basic way, how to use the SIP stack.
Todo:
* We need to implement client-side authentication for certain classes
of message. In particular, we need to make sure that NOTIFYs,
INVITEs with a Replaces header, and probably SUBSCRIBE messages need
authentication. These issues can be summed up as: we need a
user-defined set of authentication profiles.
Known bugs:
* TLS tests fail because of something to do with the certificates.
Frank Shearar, 2008/10/10
Copyright (C) 2003 Royal National Institute for Deaf People (RNID).
You may redistribute or use the source or binary code with or without
modification providing you abide by the following restrictions:-
1. You MUST distribute this agreement with any source or binary
distribution. This license will also apply to any third party who
receives the software from you.
2. You MUST acknowledge the use of RNID code in any advertising material
used to advertise ANY product or service that is derived from or
makes use of the code.
3. You MUST acknowledge the use of RNID code on splash screens, in
"about" boxes and any other location where there is a copyright
notice.
4. You may NOT use the name of the RNID in any other way, in relation
to a product or service that is derived from or makes use of the
code except with permission, in writing from the RNID.
5. You must NOT use this software or parts thereof to build products
or services that do not provide deaf, hard of hearing and speech
impaired people with equivalent service to hearing people. In
particular you may not use this software to build voice-only systems.
THIS SOFTWARE IS OFFERED FREELY AND ENTIRELY WITHOUT WARRANTY.