12. Intro to the PSTN

[@honeybees1820]

Wow! Great explanation! Keep producing lesson man..u are gifted. I totally understand the subject now as compared to other 3 videos i watched before

[@Lass-e7o]

I love this video

[@systemengineer7131]

Ok thank you so much.

[@newmoviesclips8011]

waoo thanku soo much :)

[@isumitd9586]

What is real difference of MSC and CENTRAL OFFICE SWITCH

[@blackbarry45]

and PBX

[@Lass-e7o]

I think i know what PSTN means and i need to fully understand it..

[@systemengineer7131]

If you use handouts google. you can contact with me following email address: [e-mail]