Wholesale voice traffic refers to the bulk exchange of voice minutes between telecom operators and service providers through interconnect agreements, priced per second against A-Z rate sheets rather than sold one line at a time. Buyers fall into four groups: mobile operators terminating each other's outbound calls, contact centers and BPOs with high outbound volume, SaaS vendors embedding voice into products, and resellers building retail offerings on a wholesale base. A call physically moves through four stages: SIP signaling and call setup (governed by IETF RFC 3261, where post-dial delay is largely decided), routing decisions that weigh cost against live quality, and transport and termination over RTP, with every extra carrier hop adding 30 to 80 milliseconds of latency and packet-loss risk. Wholesale traffic categories include call termination (the largest segment, priced per destination and per second), call origination (inbound delivery to a DID), Direct Inward Dialing number inventory, and International Simple Resale, where operators buy wholesale minutes and resell them as a branded retail product. Quality is judged on ASR, ACD, and MOS, with anything under 45 percent ASR on a major destination flagged as concerning and MOS below 3.5 considered noticeable to end users; commercially, per-second billing, downloadable A-Z rate sheets, and named interconnect operators separate legitimate providers from resold capacity. The biggest risk is fraud — the Communications Fraud Control Association estimates over $39 billion in annual global toll fraud from SIM-box arbitrage, traffic pumping, IRSF, and stolen-credential abuse — countered by IP authentication, per-destination spend caps, real-time alerting, and STIR/SHAKEN signing. Softtop runs a Tier-1-interconnected platform across 165-plus countries with 99.99 percent measured uptime, direct peering with major mobile operators, a downloadable A-Z rate sheet with per-second billing, default fraud controls, and bundled Wholesale VoIP, SIP trunking, DIDs, and SMS on one contract, typically activating a customer's first production call within 48 hours.