Vonage API Help Center Vonage API Help Center

Outbound SMS

SMS Being Delivered Multiple Times
Symptom When sending outbound SMS, the message is sent multiple times. A...
How can I send SMS in Hebrew?
Objective Sending Hebrew text through SMS. Applies To SMS Hebrew Proce...
Why do I see question marks in my SMS message instead of the original characters?
Question Why do I receive question marks in my SMS message instead of or...
SMS Messages to India Not Delivered
Symptom When attempting to send SMS to a number in India, the message is...
DLR Error Code 19 Facility Not Supported
Question When sending outbound SMS, I received a delivery receipt error ...
HTTP Error 413 Request Entity Too Large
Symptom When attempting to send an SMS API request, you receive HTTP err...
Error 1 When Sending Multiple SMS in Single API Request
Symptom When attempting to send multiple SMS in a single API request, yo...
Why are there different meanings to Vonage SMS Error Codes?
Question Why are there different meanings to Vonage API SMS Error Codes?...
What is the Throughput Limit for Outbound SMS?
Question What is the throughput limit for Outbound SMS? Applies To Outb...
How long is a single SMS body?
Question What is the maximum length of one SMS? Applies To SMS Characte...
Getting Started Sending SMS
Overview Developers are encouraged to view the developer's pages Working...
How do I add test numbers during my Vonage API trial?
Objective Adding test numbers during the Vonage API account trial period...
Will I be charged for rejected messages?
Question Will I be charged for rejected messages? Applies To Outbound S...
What causes a delay in delivering SMS messages?
Question What causes a delay in delivering SMS messages? Applies To SMS...
How is SMS delivery success measured?
Question How is SMS delivery success determined? Applies To Outbound SM...
What will I receive if a network or country does not support delivery receipts?
Question If a network or country does not support delivery receipts, wha...
Rejection Code 10 or Error Code 15 Illegal Sender
Symptom When sending SMS to the US or Canada, you receive Rejection Code...
What are the definitions of common SMS terminology?
Question What do the common acronyms regarding SMS mean? Applies To SMS...
Why is my Sender ID changed when I send SMS globally?
Question Why is my Sender ID changed when I send SMS globally? Applies T...
How many countries and networks can I reach with Vonage Outbound SMS?
Question How many countries and networks can I reach with Vonage Outbou...
How fast can I send Outbound SMS?
Question How quickly can I send SMS through Vonage? Applies To Outbound...
Can I change the Sender ID for Vonage Outbound SMS?
Question Can I set my own Sender ID address? Applies To Sender ID Outbo...
Does the Vonage SMS API support Unicode encoding?
Question Do Vonage APIs support Unicode encoding? Applies To Unicode En...
Do you deliver SMS to ported numbers?
Question Does Vonage deliver SMS to ported numbers? Applies To Outbound...
Why does my India Sender ID have extra letters in front of it?
Question Why does my India Sender ID have extra letters in front of it? ...
Does Vonage provide free delivery receipts?
Question Is there a charge for delivery receipts? Applies To Outbound S...
What are the issues with relying on handset delivery receipts?
Question What are the issues with relying on handset delivery receipts? ...
What happens when you send a message to a Temporarily Absent number?
QuestionWhat happens if you send a message to a temporarily absent numbe...
What happens when you send a message to a Barred Number?
Question What happens when a user sends a message to a barred number? Ap...
Why do multipart messages receive DLRs with extra latency?
Question Why are concatenated message sometimes slow to deliver? Applies...