http://www.astblog.com asterisk pbx and voip tricks and tips Fri, 19 Feb 2010 01:33:15 +0000 http://backend.userland.com/rss092 en +------------------------------------------------------------------------+ | Description | A common usage of the ${EXTEN} channel variable in a | | | dialplan with wildcard pattern matches can lead to a ... http://www.astblog.com/2010/02/18/dialplan-injection-vulnerability/ Hi All Today we will review the (+) sign in the asterisk configuration files. This can be applied to any file under the /etc/asterisk directory. [mycontext] option1=value1 ---- many others stuff ---- [mycontext] (+) option2=value2 So, basically, in the same file, you can have the same context twice. If the two contexts have the same name and the ... http://www.astblog.com/2010/01/20/asterisk-configuration-templates-use-the-option/ Hi everybody Today, we will look at the ChanSpy application. Let say you have channels coming on our asterisk and you want to be able to hear what people are doing without them knowing that. Then, Chanspy is for you. ChanSpy Synopsis Listen in on a call. Useful in a call center to monitor agents on ... http://www.astblog.com/2009/11/15/asterisk-spy-a-conversation/ If you don't want to compile asterisk on ubuntu and you are already using a debian based system like ubuntu, you can just apt-get asterisk sudo apt-get update sudo apt-get upgrade sudo apt-get install astersisk http://www.astblog.com/2009/10/27/install-asterisk-on-ubuntu-apt-get/ A missing ACL check for handling SIP INVITEs allows a device to make calls on networks intended to be prohibited as defined by the "deny" and "permit" lines in sip.conf. The ACL check for handling SIP  registrations was not affected. http://www.asterisk.org/security http://www.astblog.com/2009/10/26/asterisk-security-acl-not-respected-on-sip-invite/ Here is a great tool to monitor your web services as well as your public phone services http://www.sysmonitors.com http://www.astblog.com/2009/10/19/asterisk-and-others-pbx-monitoring/ You may have search all over the internet about a reliable way to send and receive fax using asterik and a voip connection or your TDM/T1 card you already have. Digium have a solution for you. http://store.digium.com/productview.php?product_code=804-00007 Check their free fax product. Register and install it. You can use it for free if you need ... http://www.astblog.com/2009/10/01/asterisk-send-and-receive-fax/ This feature can help you with you want to stay in the asterisk cli while running others linux commands. To do so, you can prefix the command by ! (exclamation point). Example : ouidah*CLI> !date Wed Aug  5 20:48:22 EDT 2009 ouidah*CLI> http://www.astblog.com/2009/08/05/asterisk-run-linux-command-from-asterisk-cli/ Today (2009-09-03), a vulnerability was discoved in asterisk RTP stack and may allow a remote user to make your server crash by sending malformed RTP packets. Only 1.6.1 versions are affected. Please upgrade. Here is the full vulnerability release. Asterisk Project Security Advisory - AST-2009-004 +------------------------------------------------------------------------+ |       Product        | Asterisk                                        | |----------------------+-------------------------------------------------| |       Summary        | Remote ... http://www.astblog.com/2009/08/03/asterisk-security-ast-2009-004-remote-crash-vulnerability-in-rtpstack/ Maybe you want to do something that does not exist on asterisk or you want to write your own asterisk applicaiton. if so, you may read this sample provide in asterisk source code under apps/app_skel.c Basicly, what you need to know, is at startup, asterisk will load your application by running the ... http://www.astblog.com/2009/08/01/write-your-own-asterisk-application/