Protocol
Toll-Free (8XX)
TFN · 800 Service · SMS/800 · Toll-Free Number
Toll-free / 8XX service translates a dialed toll-free number to a routing number or carrier via an SCP (SMS/800, RespOrg databases) over SS7 AIN/INAP-style queries. Modern IP paths may use ENUM or HTTP NP/TF APIs, but the control-plane idea remains a database dip before the IAM/INVITE is routed.
Domains
Layers
Tags
ss7toll-free8xxscpresporgtranslation
Sources
- SMS/800 / RespOrg industry practices
- AIN / INAP toll-free trigger flows
Related protocols
AIN
Lab readyNorth American Advanced Intelligent Network defines detection points, triggers, and SCP transactions (often over TCAP) for number transla…
LNP
Lab readyLocal Number Portability lets a subscriber keep an E.164 number when changing carriers. Originating switches query an NPDB (often via TCA…
INAP
Lab readyIntelligent Network Application Part for fixed-network service control over TCAP. CS-1/CS-2 operations resemble CAP but target wireline S…
TCAP
Lab readyTransaction and dialogue layer over SCCP for intelligent-network and mobile services. Begin/Continue/End/Abort components carry MAP, CAP,…
ISUP
Lab readySS7 call-control user part for trunk setup: IAM, ACM, ANM, REL, RLC and related messages. Circuit identification codes bind signaling to …
ENUM
Lab readyDNS-based mapping of E.164 telephone numbers to URIs via NAPTR records (often sip: or mailto:). Used in number portability, VoIP peering,…
SS7 MSU
Lab readySS7 Message Signal Units carry user-part payloads over MTP. Level-2 framing wraps length, sequence/ACK bits, and SIO/SIF; Level-3 routing…