http://www.surfnet.nl/innovatie/surfworks/voip
The SURFnet project called ‘SURFWorks’ has a component to stimulate the use of Voice over IP
and VC, obtain knowledge and disseminate it and provide an H.323 and SIP service.
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[IP Telephony Cookbook] / Appendix A European IP Telephony Projects A. 7 VC Stroom
http://www.surf.nl/projecten/index2.php?oid=136
VC Stroom is a project of multiple institutions in the Netherlands to promote the use of VC in the educational setting.
A. 8 Voice services in the CESNET2 network
http://www.cesnet.cz/english/project/iptelephony
The CESNET IP Telephony project started in 1999 with the goal of investigating the possibilities of data and voice network convergence. CESNET operates the Czech NREN. A lot of experience was acquired about the optimal interconnection configurations of various telephony devices (PBXs with different interfaces, voice gateways, gatekeepers, IP phones, etc.). It turned out that most popular IP Telephony service has been least-cost routing. Over time, the 24 PBXs in universities and research institutes have been interconnected over the Czech NREN with two gateways to PSTN.The network structure is illustrated in Figure A.1.
Figure A.1. CESNET IP Telephony Network
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[IP Telephony Cookbook] / Appendix B IP Telephony Hardware / Software Appendix
B IP Telephony Hardware/Software
> Product Name: Windows Messenger
Product URL: http://www.microsoft.com/windows/messenger/
Vendor: Microsoft
Supported Protocols: SIP
Platform:Windows
Description: A well-know SIP softphone from Microsoft.There are different versions of the software and not all of them support SIP.This is unfortunately confusing.The most standard
-compliant seems to be version 4.7.The phone is easy to use, but there are several violations of specifications. It supports audio, video, instant messaging and white board.
The client sends BYE instead of CANCEL. Microsoft uses a ‘proprietary extensions of the presence’ document and some other software vendors implemented the extensions as well.The realm of digest credentials must be same as the hostname of the server; otherwise the client refuses to authenticate.
New versions of Windows Messenger use INVITE to establish a session before an instant message is sent and thus are incompatible with other user agents, even with older versions of Windows Messenger. It does not support any NAT traversal techniques but it can be used from behind NATs with some aid from a SIP server in the public Internet because it implements symmetric media and signalling.
> Product Name: kphone
Product URL: http://www.wirlab.net/kphone/
Vendor:Wirlab
Supported Protocols: SIP
Platform: UNIX/Linux
Description: A user agent for Linux.Versions up to 4.0 were linked with KDE, starting from 4.0
kphone. It does not require KDE libraries anymore and uses qt only.The phone supports presence and instant messaging based on SIMPLE standards.Video conversation is supported using vic.The phone is not very stable yet and crashes from time to time. It supports G.711, GSM, and iLBC
codecs.
> Product Name: Linphone
Product URL: http://www.linphone.org/
Vendor: Simon Morlat
Supported Protocols: SIP
Platform: UNIX/Linux
Description: It is a simple SIP user agent for Linux and uses the GNOME frameworks.The phone is unstable and crashes from time to time.
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[IP Telephony Cookbook] / Appendix B IP Telephony Hardware / Software
> Product Name: X-Pro, X-Lite
Product URL: http://www.xten.com/
Vendor: Xten Networks
Supported Protocols: SIP
Platform: N/A
Description: It is a good softphone with many interesting features. It has sophisticated NAT
detection mechanisms. SIP support is good.There seem to be no interoperability issues (as far as we have tested). X-lite is a free version; X-Pro must be purchased.The softphone is also available also for WindowsCE-based PDAs.