A2P
Application-to-Person messaging – automated SMS from apps/businesses to people (OTP, alerts, promotions, reminders)
Billing
how you charge customers for your telecom services (per minute, per message, per GB, monthly subscription, etc
CLI
Caller Line Identification
DID
Direct Inward Dialing – virtual/local phone numbers that route calls directly to your PBX/VoIP system, no operator needed
IRSF
International Revenue Share Fraud
LCR
automatically choosing the cheapest reliable route for each destination
Marketing
getting the right people to know, like, and buy your telecom services
Negotiation
a discussion to reach a mutually beneficial agreement on price, terms, volume, quality, and payment
Origination
receiving incoming calls (the opposite of termination)
PBX
Private Branch Exchange – a company's internal phone system
PQC
a real category of cryptographic algorithms specifically designed to resist quantum-computer attacks (NIST formally standardized several in 2024)
Rates
the price per minute/message/GB for a telecom service
Sales
finding, qualifying, pitching, and closing new business
SBC
a device/gateway that sits at the edge of a VoIP/SIP network, controlling, securing, and optimizing SIP sessions (calls, video, messaging)
SMS
Short Message Service – text messaging over mobile networks
TDM
traditional circuit-switched voice paths using physical trunks (T1/E1, PRI, ISDN) instead of IP/VoIP
Termination
delivering an outbound call to its final destination on the real phone network — a mobile handset, a landline, another carrier
VoIP
Voice over Internet Protocol (cheap international calls over internet)
