Author: Min Wang

C++ function overloading, name mangling, name hiding are somehow related to the same issue: overload resolution at compile time ( note override is run-time resolution). What is C++ Function overloading: two or…

It is quite easy to setup a ipv6 testbed at home now. (1) setup linux ipv6 router apt-get install radvd  # on a vm or real box debian and copy the…

maven basic On debian 8: apt-get install mvn  # this will install maven 3.0 mvn archetype:generate –DgroupId=com.mycompany.app –DartifactId=my–app –DarchetypeArtifactId=maven–archetype–quickstart –DinteractiveMode=false it basically  mkdir -p src/main/java/  ( put your java file here), create…

On Debian 8 (1) download and install JDK 8 from oracle (2) download and install Eclipse IDE for Jave EE (3) apt-get install  tomcat8 tomcat8-admin tomcat8-examples tomcat8-user mysql-server (4) git clone https://github.com/mingewang/HibernateDataSource…

Fax ( over VoIP) Error:  Error Far end cannot receive at the size of image Resolution (1): from http://help.activepbx.com/KB/a69/error-far-end-cannot-receive-at-the-size-of-image.aspx When you scan from certain Scanners it flips the image horizontally open…

SIP protocol always seems to be complicated than I thought/expected. one example : Sip header Privacy This header is like this: Privacy: value the value could be: header, session, user, none, and…

If you are  interested in the webrtc, this project is quite interesting great demo at: https://janus.conf.meetecho.com/demos.html the source code is at: https://github.com/meetecho/janus-gateway I did contribute two commits a year ago https://github.com/meetecho/janus-gateway/commits?author=mingewang…

I tried to use asterisk real time db, and somehow sip show peers does not show anything, After couple of hours googleing , and found this: rtcachefriends (global) If is turned…

Treat others as you would be treated. Treat others as they would like to be treated.   Some interesting articles: https://en.wikipedia.org/wiki/Golden_Rule http://www.peterstark.com/leaders-golden-rule/      

Someone asked me to convert pdf 1.1 to 1.4,  I googled around, and found this: http://stackoverflow.com/questions/3450616/convert-pdf-from-version-1-1-to-1-4-or-higher Pdf 1.1 is forward compatible with pdf 1.4. Everything in pdf 1.1 will work…