touchtone or sms verification

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Project Description

We have a Drupal website which bulk generate coupons/vouchers.

We would like to have a method to verify voucher when no access to the internet is available.

We would like a facility where through telephone or sms the vouchor is verified.

Process would be:

- either customer telephones using touchtone or sends SMS with voucher code

- you system does a lookup against our db to verify the code , if valid it sends a sms back saying valid

- the voucher code in the db status is changed to verified

Please contact me with your experience/silimar project relating to touchtone transactions or SMS verification.

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