Inbound SMS Guidelines
This section provides important information about receiving inbound SMS using DIDWW Trunks. If you encounter issues receiving SMS on your DID numbers, review the following points to better understand potential limitations and requirements.
1. Local SMS Traffic
DID numbers are optimized for receiving SMS within the country where they are registered. However, the delivery of international SMS may be impacted by:
Local restrictions: Certain countries impose regulatory or technical limitations on receiving international SMS traffic.
Outdated routing databases: Originating networks may use outdated or incomplete routing information, resulting in failed SMS delivery.
2. Application-to-Person (A2P) Messaging
DID numbers are designed for two-way communication. However, certain countries may restrict A2P traffic to DID numbers due to local regulations.
Important
A2P messages may also undergo validation by originators to minimize costs. Validation tools may incorrectly flag DID number prefixes as invalid if they rely on outdated or incomplete databases.
3. SMS Verification Warning
The use of DID numbers for SMS verification purposes is not recommended. DID numbers are non-exclusive, meaning the same number may be allocated to multiple parties over time.
Troubleshooting SMS Issues
If you experience SMS delivery issues after reviewing the considerations above, contact DIDWW Technical Support at support@didww.com and provide the following details to assist with troubleshooting:
Date and Time (UTC): Specify when the SMS was sent.
Originating Number: The phone number that sent the SMS.
Destination DID: The DID number intended to receive the SMS.
Providing this information will help the DIDWW support team investigate and resolve the issue efficiently.