आपका फोन, टेलीफोन एक्सचेंज से कैसे चलता है ??

[@simongumes1896]

Nice 👍

[@motupatlu9919]

Very well knowledgeable video

[@sandeepsldm]

Good explanation sir. Thank you very much.

[@randhirbal9502]

Sir Line Man telephone lines mein aane wale noise ko kaise theek Karta Hai Is per detail video banaen sar vid tric

[@randhirbal9502]

Well explain sir thanks

[@satishkumarkashyap8028]

बेहतर nowlage sir

[@satishkumarkashyap8028]

सर्वर कैसे काम करता है इस पर भी एक वीडियो बना दो सर🤗