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#mobile phone #call connection #entering number #dialing out #calling number #contact number

📞🔌↔️☎️

#call connection #telephone exchange #patching #connecting calls #phone line #routing

📞🔗🗣️

#call linked #joined call #call connection #phone link #call established #connected conversation #voice link

☎️➡️🏢➡️📞

#PSTN #central office #telephone exchange #call connection #phone network path #landline infrastructure