It sounds like you want to allow a client to connect to you on SMPP and send messages via your system. If this is correct then you need to be a SMPP SMSC and currently your kannel is only acting as an ESME .
To get Kannel to act as a SMSC you need to install a version of SMPP which will act as a SMSC and allow clients to connect to send a message. Because Kannel doesn't have this built in you can try installing the open source software called OpenSMPPBox
OpenSMPPBox is included in the Addons folder of the latest Kannel development release (version 1.5.0). You'll need to install this via SVN to get the code and then compile this on your machine to get OpenSMPPBox up and running. You have to also download the latest version of kannel's source code in order to compile OpenSMPPBox.
Once you have installed OpenSMPPBox it connects to Kannel's Bearerbox and operates as a way to allow clients to connect to you on SMPP and then route messages straight to Kannel. When it is running you can set a username and password for a client and give them your server IP to connect.
There's a Manual for OpenSMPPBox which will help with the installation and configuration.