Odoo is the world's easiest all-in-one management software. It includes hundreds of business apps:
CRM | e-Commerce | Accounting | Inventory | PoS | Project management | MRP | etc.
If you are using SMS Client from Julius, take a look at this link.
Take a subscription to an SMS service provider. (just try with this provider )
After subscribing with an SMS Service Provider, you will get all the needed parameters to configure the Gateway.
Added after comments.
If Kalkun is configured and running, follow those steps:
1_ In Kalkun add a user (The username must be the same as in OpenERP)
2_ Configure Kalkun gateway as follow: