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Category Archives: Actual topics from IT

Actual topics from IT

SIP DTMF Signalling

There are 3 common ways of sending DTMF on SIP calls SIP INFO packets As specially marked events in the RTP stream – see: RFC 2833 inband as normal audio tones in the RTP stream with no special coding or markers In sip.conf file in asterisk settings write dmtf=info and don’t forget to set this option also on your VoIP client

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libnet install error “no destination specified”

What is Libnet? Libnet is a generic networking API that provides access to several protocols. It is not designed as a ‘all in one’ solution to networking. Currently many features that are common in some network protocols are not available with Libnet, such as streaming via TCP/IP. We feel that Libnet should not provide specific […]

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Moving VirtualServers from host to host

Common problem with moving vhost from one host to another is that you don’t have network connection that you have had on previous host. It might be problem with MAC addresses like I had with my VirtualBox. Solution is to rewrite MAC addresses from ifconfig from your vhost to VirtualBox settings, so please: type ifconfig […]

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Run tcpdump as a daemon

Well you can’t run it as a daemon since there is no method for tcpdump (http://www.daemon-systems.org/man/tcpdump.8.html), but you can do a little trick. You can call nohup utility which allows to run command./process or shell script that can continue running in the background after you log out from a shell. In case of any errors you […]

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