Dedicated short codes deliver 100+ TPS and zero carrier spam filtering, while 10DLC offers affordable $1/mo numbers capped at 10-75 TPS subject to Campaign vetting.
When scaling verification traffic beyond 50,000 messages per month in North America, choosing between Dedicated Short Codes and 10-Digit Long Codes (10DLC) determines both budget and deliverability. This guide contrasts their technical capabilities, registration timelines, and carrier throughput quotas.
1 Dedicated Short Codes Architecture
Short codes are 5 or 6-digit phone numbers (e.g. 24424) pre-approved by major wireless carriers for high-throughput commercial broadcasting. Benefits include:
- Extreme Throughput: Standard tiers deliver 100 messages per second (TPS), scalable to 500+ TPS.
- Zero Filtering: Whitelisted directly in carrier signaling networks; never subjected to heuristic content filters.
- Cost: $500/month for random codes, $1,000/month for vanity codes, plus carrier setup fees. Approval takes 6-12 weeks.
2 A2P 10DLC Mechanics
A2P 10DLC enables standard 10-digit local numbers for commercial messaging under The Campaign Registry (TCR). Characteristics:
- Scaled Throughput: 10 to 75 TPS depending on Brand Trust Score.
- Cost: $1 to $2/month number rental, plus one-time $44 campaign review fee.
- Approval: Automated vetting completes within 24 to 72 hours.
3 Decision Framework for Engineering Leads
Choose 10DLC if total volume is under 200,000 messages/month and temporary carrier registration delays during flash traffic spikes are acceptable. Choose Dedicated Short Codes if you require flash delivery during major events (ticket drops, authentication surges) or send more than 500,000 OTP messages monthly.
Frequently Asked Questions • OTP & 2FA Engineering
No. Short codes are strictly national and only function within the specific country where they are provisioned (e.g. US short codes only reach US subscribers).
10DLC routes have rigid carrier TPS rate caps. Sudden spikes will queue in the aggregator's buffer, increasing end-to-end OTP latency unless rate throttles are configured.