SIP (Session Initiation Protocol) is an IETF standard protocol for
interconnecting telephone devices over TCP/IP networks. GNU SIP Witch
is a call server which implements the SIP protocol standard while
supporting generic phone system features like call forwarding, hunt
groups and call distribution, call coverage and ring groups, holding and
call transfer, as well as offering SIP specific capabilities such as
presence and messaging. GNU SIP Witch will support use of secure
telephone extensions and enables communication privacy through the use
of peer-to-peer audio and video sessions directly between connected
endpoints. GNU SIP Witch also supports placing and receiving calls with
directly with remote users over the public Internet without requiring
the use of mediating VOIP "service providers" in what is commonly called
SIP "Business-to-Business" (b2b) calling.
GNU SIP Witch can be used together with and to interconnenet common free
software and IETF standard compliant voice and video capable SIP based
desktop softphone applications such as Ekiga, Twinkle, Linphone, and
OpenWango, as well as most standard compliant SIP telephone devices.
When used together with a standard compliant SIP media application
server such as GNU Bayonne, GNU SIP Witch will be able to offer users
and remote callers access voice messaging and media application
services. In the future GNU SIP Witch will offer STUN services and
optional packet forwarding to facilitate interconnection when behind
NAT's and firewalls in IPV4 networks. GNU SIP Witch also supports IPV6.
GNU SIP Witch is not a SIP proxy, a multi-protocol telephone server, or
a IP-PBX, and does not try to address the same things like asterisk,
yate, or GNU bayonne2, all of which make use of direct media processing
where media connections and streaming are at least initially established
between each endpoint and the IP-PBX server itself. Direct media
processing adds additional latency, and by introducing a central point
where all media streams can be processed, compromises both the privacy
of calls and security of encrypted telephone sessions.
Instead, GNU SIP Witch focuses on doing just one thing as a pure SIP
call server, and will try to do that one thing very well. My goal is to
focus on achieving a network scalable telephone architecture built
around the SIP protocol that can be deeply embedded, which can support
secure calling nodes, that can integrate well with other SIP
based/standards compliant components, and, by not engaging in media
processing, that is not license encumbered by the use of "mandated"
patent encumbered and proprietary telephony media codecs.
The initial release of GNU SIP Witch (0.1.0) only offers support of SIP
registration, multi-target registration, authentication peering over
SIP, querying of registered user agents, basic audio and video call
processing between locally registered user agents with call distribution
for multi-target registrations, and basic SIP instant messaging.
GNU SIP Witch requires the GNU oSIP library and eXosip extension
library, and the (GNU) uCommon/GNU Common C++ 2.0 core library. GNU SIP
Witch is offered under the terms of the GNU General Public License
Version 3 or later, and has no dependencies on non-free software. GNU
SIP Witch can be compiled and used on any GNU/Linux distribution
supporting GCC 2.95 or later, has been tested with OpenSolaris,
Free/Open/NetBSD, OS/X, QNX Nutrino, and can be built for use on
Microsoft Windows targets using Debian GNU/Linux hosted MinGW32
toolchains. GNU SIP Witch is a free software package that is part of
the GNU Project and the GNU Telecom Subsystem.
Downloading Source:
GNU SIP Witch ftp://ftp.gnu.org/gnu/sipwitch
GNU uCommon ftp://ftp.gnu.org/gnu/commoncpp
GNU oSIP2 ftp://ftp.gnu.org/gnu/osip
libeXosip2 http://download.savannah.nongnu.org/releases/exosip
Web Resources:
http://www.gnu.org/software/gnucomm
http://www.gnutelephony.org
http://savannah.gnu.org/projects/gnucomm
Mailing Lists and email contacts:
mailto:[EMAIL PROTECTED]
http://lists.gnu.org/mailman/listinfo/bug-gnucomm
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