Learn more about SIP.
The iLabs team has some additional resources available at Opus One's web page (including copies of all these white papers) at www.opus1.com/sip/
Columbia's Computer Science department maintains an extensive list of SIP resources
General overviews of what SIP is all about
The iptel.org 180+ page SIP tutorial is outstanding. Another overview that is a bit more market-oriented and nearly as long.
A short technical introduction
A short non-technical introduction
White paper on the SIP value proposition over telephony, SIP and the new network communications model (from Nortel Networks).
Doug Moeller's full-day VOIP tutorial, including SIP, to help you with telephony terms (a Zip file).
Internet2 SIP Initiative
The Internet2 SIP.edu initiative seeks to promote the convergence of voice and email identities, grow SIP reachability within Internet2, and encourage experimentation with new enterprise SIP services. A lot of SIP is "happening" there and some of the information is especially appropriate to very large deployments.
Initiative Overview SIP.edu in a Nutshell
How SIP uses DNS
Most enterprises will want to integrate their SIP networks with DNS to facilitate interoperability and mixing of devices and servers. The SIP.edu project has a good tutorial on how to use DNS to locate SIP services within a network.
ENUM (see our white paper on ENUM) helps to link SIP VoIP networks with the PSTN using DNS. The ENUM Forum is an industry group concerned with ENUM and its use internationally. An ENUM tutorial (PowerPoint) is available from the ENUM Forum.
ENUM.ORG is the home of ENUM in the US (North America, really)
SIP RFCS And Drafts
The SIP RFCs and related Internet drafts are available at several sites. An especially nicely organized set is here.
The IETF SIP Working Group, with a a frequently-updated working group information page.
Do It Yourself Help
IP Telephony Cookbook is a great reference on deploying VoIP.
Free World Dialup is an international, free, SIP network.
Brix Networks provides a free, self-service, VoIP quality testing portal - TestYourVoIP.com - that enables users to independently measure the quality of their VoIP connections.
Commercial SIP and Vendor Forums
Center for commercial SIP development
The SIP vendor forum, including good product listings.
Vendors appearing in the iLabs Voice Over IP Using SIP booth
AudioCodes www.audiocodes.comwww.avaya.comwww.cisco.comwww.clearsight.comwww.digium.comwww.dlink.comwww.freeworlddialup.comwww.grandstream.comwww.intetex.comwww.ipdialog.comwww.iptel.orgwww.multitech.comwww.nortel.comwww.pingtel.comwww.polycom.comwww.pulver.comwww.siemens.comwww.snom.comwww.3com.comwww.wildpackets.comwww.xten.com
Avaya
Cisco Systems, Inc.
ClearSight Networks Inc.
Digium
D-Link
Free World Dialup
Grandstream
Intetex
ipDialog, Inc.
iptel.org Services
Multi-Tech Systems
Nortel Networks
Pingtel
Polycom, Inc .
Pulver Innovations
Siemens
snom technology AG
3Com
WildPackets, Inc.
Xten