Voice over IP: Difference between revisions
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* [http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032256313&Culture=en-US MSDN Webcast: Visual C# Express 2005: Creating an Instant Messaging Application Part 2 of 3] | * [http://msevents.microsoft.com/CUI/EventDetail.aspx?EventID=1032256313&Culture=en-US MSDN Webcast: Visual C# Express 2005: Creating an Instant Messaging Application Part 2 of 3] | ||
* [http://www.codeproject.com/useritems/SIP_stack_with_SIP_proxy.asp SIP stack with SIP proxy - (VOIP)] | * [http://www.codeproject.com/useritems/SIP_stack_with_SIP_proxy.asp SIP stack with SIP proxy - (VOIP)] | ||
* [http://en.wikipedia.org/wiki/STUN STUN (Simple Traversal of UDP (User Datagram Protocol) through NATs (Network Address Translators))] | |||
====Tech-invite==== | ====Tech-invite==== | ||
Revision as of 08:59, 2 October 2007
<google>ENGELSK</google>
Soft Phones
SJphone
SJphone is a free VOIP softphone. It can be installed on:
- Windows (XP SP2, 2000 SP4, Vista, Vista x64), Windows CE (Pocket PC, Windows Mobile), Linux, MAC
It supports both SIP and H.323 standards, and has a brilliant logging feature if you are having trouble getting a call through.
Note for Vista x64 (64 bit version) users:
On my Dell Lattitude I couldn't make a call or run the Audio Wizard, it crashed the program. I found a workaround:
- Select: Menu -> To Advanced Mode
- Select: Menu -> Options
- Select: the Audio tab.
- Select: Advanced Settings...
- Uncheck: Enable Adaptive Echo Canceller
After that, I can make a call, and it is also possible to run the Audio Wizard....
I found this by trial and error, first I disabled everything in the 'Audio' tab, and reduced the sample rate, then I gradually enabled everything again.
In SJ Labs forum http://forum.sjphone.org/viewtopic.php?t=1589&highlight=aec you can read the following:
- Bugs and issues in 1.65
- 1. Although there is a Video tab on the Options panel, this build does not support Video.
- 2. AEC may work unstably if you use some old audio boards, or use different devices for input and output audio (for example, a USB mic and on-board audio system).
- 3. SJphone may deliver sound with less high frequency. In this case, reduce Driver sampling rate to 8000 (Options -> Audio -> Advanced Audio Settings).
This might explain my problem, but I was able to run it on the same Dell D620 without any problems, when it was running Windows XP.
Service Providers
Links
- Microsoft Real-Time Communications: Protocols and Technologies
- MSDN Webcast: Visual C# Express 2005: Creating an Instant Messaging Application Part 2 of 3
- SIP stack with SIP proxy - (VOIP)
Tech-invite
- ABNF Grammar for SDP -- Session Description Protocol (RFC 4566)
- SIP Protocol Structure through an Example
Microsoft
<google>ENGELSK</google>