If you were unhappy with the performance of echo suppressor in PJMEDIA, specially on mobile devices, This is partially due to AEC, Acoustic Echo Canceler cannot be used on these devices due to the high processing requirements.
PJSIP group has whipped up a completely new echo suppressor, and according to a post on the PJSIP Blog, it works better than before. I have had no time to test yet but will be working on doing so next week.
In tests conducted by the development team, on PocketPC 2003 PDA with 312MHz StrongARM CPU,(which I am using for mobile tests as well) it only used less than 0.5% (half percent) of CPU.Not only that it used a very little CPU power, it was able to suppress echoes! That indeed is good news.
The new echo suppressor is available in SVN at pjmedia/echo_suppress.c, and it will be included in the next release.
Free SIP Accounts
More here:
High Performance Echo Suppressor For PJMEDIA
August 16th, 2008
I think you better learn if you did not know before. Government could alway listen to your conversations if it wanted, legally, with a warrant.
But with FISA, which President Bush signed (Foreign Intelligence Surveillance Act) Amendments Act of 2008 into law, it does not need warrants. John Edwards of VoIP News has done a better job of describing the procedures that the government may use for the surveillance and collection of “foreign intelligence information” between “foreign powers” and “agents of foreign powers.” Read and educate yourself.
Go here to read the rest:
Do You Know WHat FISA Is?
August 15th, 2008
I see a lot of people looking for chan-mobile information. Since I wrote about configuring chan-mobile (Chan_mobile) last time, things have changed a bit.
chan-mobile is a part of the Asterisk development and will be appearing on your server computer with the release of Asterisk 1.40. You can browse the chan-mobile at the development tree at Asterisk SVN server. So if you are running the development version, you should have in your SVN tree.
If you need to get it running with Asterisk 1.4X. Follow the simple instructions, you can have your Asterisk over Bluetooth! in no time. Using chan-mobile with Asterisk 1.4.x requires patching the development version of asterisk-addons and compiling with Asterisk 1.4.x, not a big deal.
Follow the process below
- Checkout the trunk version of asterisk-addons from Digium’s SVN repository
- Download the chan-mobile 1.4X patch from here. Save it to asterisk-addons directory.
- Change to the asterisk-addons directory
- patch -p0 chan_mobile-1.4.x.patch
- ./configure
- make menuselect
- make
- make install (as root)
You are done!. Now you have Asterisk with chan-mobile enabled. One of the most common problems are missing bluez! chan-mobile requires that the bluez headers and libraries are installed on your system. Most distributions provide a package that contains the blue-z development libraries. It is probably called something like libbluetooth-dev. Use the latest versions from the blue-z website. Download and install both the bluez-libs and bluez-utils packages.
Please also check the Digium Bug Tracker (this link tekes you directly to chan-moblie issues) as any issues and new developments will be listed.
Read more:
chan-mobile on Asterisk 1.4
August 14th, 2008
SCOTTSDALE, Ariz. — Aug. 7, 2008 — General Dynamics C4 Systems, has been awarded a $2.8 million contract by the National Security Agency (NSA) to add a new Public Switched Telephone Network (PSTN) feature to the Sectéra® vIPer™ Universal Secure Phone. The new feature, called “PSTN Connect,” will enable the vIPer Phone to connect with traditional telephone networks, enabling users of secure desktop phones to use one secure phone on either PSTN or VoIP networks. The vIPer Phone currently operates on Internet Protocol (IP) networks.
“The idea behind PSTN Connect is to provide users with a flexibility they don’t have today. For example, the vIPer Universal Secure Phone will appeal to those whose installations currently use the PSTN network, but who plan to migrate to voice over IP; users who currently have voice over IP networks; and others who plan to stay with traditional PSTN,” said John Cole, vice president of Information Assurance for General Dynamics C4 Systems. “It’s about protecting our customers’ investments by providing a product that will accommodate evolving communications technologies.”
Introduced in 2006, the Sectéra vIPer Phone remains the only voice over IP phone certified by the NSA to protect information classified Top Secret and below over commercial networks. The vIPer Universal Secure Phone, with PSTN Connect, will be submitted for NSA certification testing in the third-quarter of 2008. The vIPer, with PSTN Connect, upon successfully completing certification testing, will provide secure phone users with a cost effective solution for replacing legacy secure phones, including the Secure Telephone Unit (STU-III).
General Dynamics C4 Systems, a business unit of General Dynamics (NYSE: GD), is a leading integrator of secure communication and information systems and technology. The company specializes in command and control, communications networking, space systems, computing and information assurance for defense, government and select commercial customers in the United States and abroad.
General Dynamics, headquartered in Falls Church, Va., employs approximately 84,600 people worldwide and anticipates 2008 revenues of approximately $29.5 billion. The company is a market leader in business aviation; land and expeditionary combat systems, armaments and munitions; shipbuilding and marine systems; and information systems and technologies. More information about the company is available on the Internet at www.generaldynamics.com.
Go here to read the rest:
August 13th, 2008
The Asterisk.org development team has released Asterisk versions 1.4.21.2 and 1.2.30 as well as new versions of three libraries used with Asterisk.
The Asterisk releases include fixes for two security issues. Both of these issues affect users of the IAX2 channel driver. For more details on these vulnerabilities, see the published security advisories, AST-2008-010 and AST-2008-011.
AST-2008-010: Asterisk IAX ‘POKE’ resource exhaustion
AST-2008-011: Traffic amplification in IAX2 firmware provisioning system
The three libraries used with Asterisk that are updated are;
libpri-1.2.8:
This release contains a number of bugfixes that had been unreleased for months, along with clarification of the licensing of the source code. The change log.
libpri-1.4.7:
This release contains primarily only clarification of the licensing of the source code and some minor build system fixes. There is no need for users of version 1.4.6 to upgrade. The change log.
libss7-1.0.1:
This release contains a number of bugfixes, along with clarification of the licensing of the source code. The change log.
All releases could be downloaded from Asterisk downloads site.
Here is the original:
Asterisk versions 1.4.21.2 and 1.2.30 And Three New Versions of libpri Released.
August 12th, 2008
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