Hello,
We have already developed application to send sms from multiple GSM ports. It has all the features you need plus it has so many features that can be useful to you.
Here are the features
- Simultaneous connection of multiple GSM ports
- Import numbers from text, CSV, Excel or phone books.
- Bulk USSD checker.
- Keeps track of sending count by today and total.
- Remove duplicate numbers before sending.
- Remove invalid or DND numbers before sending.
- Support SpinTax to send different messages.
- Flash SMS
- Unicode SMS support for different languages (like Hindi, Italian, German etc.)
- Add your own numbers after some numbers in your sending list.
- Compose special messages for each number (just like mail merge)
- See Inbox messages
- Phone book to manage contacts group wise.
- Manage your Do Not Disturb numbers who don't want to receive SMS from you.
- Manage your failed list which has numbers that are not working or SMS always fails.
- History of your sent messages. You can export history of sent messages for giving it your client.
- Options to increase or decrease the speed of sending.
Let me know if you want demo in your PC