What does PSTN stand for?

What does PSTN mean?

PSTN	Public Switched Telephone Network Computing » Drivers
PSTN	Public Switched Telephone Network Computing » General
PSTN	Public Switched Telephone Network Governmental » Military
PSTN	Public Switched Telephone Network Business » General
PSTN	Public Switched Telephone Network Computing » Networking
PSTN	Public Switched Telephone Network Computing » Telecom
PSTN	Public Switched Telephone Network Computing » Hardware
PSTN	Public Switched Telephone Network Internet
PSTN	Public Switched Telephone Network Community » Conferences
PSTN	Public Switch Telephone Network Miscellaneous » Unclassified
PSTN	Public Switched Telephony Network Miscellaneous » Unclassified
PSTN	Public Switching Telephone Network Miscellaneous » Unclassified
PSTN	Plain Standard Telephone Network Miscellaneous » Unclassified
PSTN	Public Switched Telephone Networks Miscellaneous » Unclassified