Vonage API Help Center Vonage API Help Center

SMS

SMS

Generic SMS KB articles

Toll-Free Number (TFN) Registration Helpers
Vonage Opt-Out Assist
Toll-Free Number Changes Oct 1, 2022 (FAQ)
Sprint/T-Mobile Network Changes
SMS/MMS Verizon Pass-through Fees
Setting a Validity Period (TTL) for SMS/MMS
See all 11 articles

Country-Specific Features and Restrictions
Asia
Africa
Central America
Europe
Middle East
North America
Oceania
South America

Outbound SMS
SMS Best Practices During COVID-19 for Users Sending Traffic to North America
Troubleshooting SMS Delivery
Global Sender ID Portal - FAQs
Global Sender ID Registration Guide
Recommended Sender ID option for A2P Alert and Transactional Messages to US Virtual Numbers
Partner Quota Violation Error
See all 77 articles

Inbound SMS

Vonage inbound reach for receiving SMS to our virtual numbers

How long does Vonage retry inbound SMS/DLRs via SMPP connection? 
How does Vonage prevent spam inbound messages being sent to Vonage rented LVNs?
Are inbound SMS LVN available all over the world?
Are inbound SMS free of charge all over the world?
Can I only receive inbound SMS without sending outbound SMS?
Why are Verification Codes not received on my virtual number?
See all 12 articles

US Short Codes
US Short Code Registry Leases – Brand & Content Provider Vetting Requirements
How-To Complete a US Short Code Program Brief & Canada Short Code Application Form
Can I add a template to my active Alerts shared short code campaign?
Why did my PIN code get sent from a phone number?
Can you receive inbound SMS on dedicated US short codes?
How are STOP requests handled on the Alerts pre-approved short code?
See all 24 articles

SMPP
How do I send concatenated messages via SMPP?
“Window of time” to submit a multipart SMS over SMPP
TLS certificates for SMPP nexmo.com
TLS certificates for SMPP vonage.com
Why are SMPP concatenated messages not delivered?
How to Read a Vonage SMPP Delivery Receipt
See all 32 articles

US 10 DLC
10DLC - Update - Reseller ID requirements (Jan 2025)
10DLC - Update - Brand Authentication+ verification (Oct. 2024)
10DLC - Update - Introducing campaign updates reviews (Oct. 2024)
10DLC - Update - New campaign requirements (January 2024)
10DLC - Campaign requirements
10DLC - T-Mobile - Traffic Violation Fines (Jan 1st, 2024)
See all 51 articles