This chapter is a more detailed guide on how to set up Kannel as an SMS gateway.
To set up an SMS gateway, you need, in addition to a machine running Kannel, access to (an operator's) SMS center, or possibly to multiple ones. The list of supported SMS centers and their configuration variables is below.
If you do not have such access, you can still use Kannel as an SMS gateway via phone-as-SMSC feature, by using a GSM phone as a virtual SMS center.
In addition to an SMS center (real or virtual), you need some server to handle any SMS requests received. This server then has simple or more complex cgi-bins, programs or scripts to serve HTTP requests generated by Kannel in response to received SMS messages. These services can also initiate SMS push via Kannel smsbox HTTP sendsms interface.
To set up a SMS Kannel, you have to edit the 'core' group in the configuration file, and define an 'smsbox' group plus one or more 'sms-service' groups, plus possibly one or more 'sendsms-user' groups.
For the 'core' group, you must set the following variable: smsbox-port. In addition, you may be interested to set unified-prefix, white-list and/or black-list variables. See above for details of these variables.
A sample configuration file smskannel.conf is supplied with the standard distribution. You may want to take a look at that when setting up an SMS Kannel.
To set up the SMS center at Kannel, you have to add a 'smsc' group into configuration file. This group must include all the data needed to connect that SMS center. You may also want to define an ID (identification) name for the SMSC, for logging and routing purposes.
SMSC ID is an abstract name for the connection. It can be anything you like, but you should avoid any special characters. You do not need to use ID, but rely on SMS center IP address and other information. However, if you use the ID, you do not need to re-define sms-services nor routing systems if the IP of the SMS Center is changed, for example.
Common 'smsc' group variables are defined in the following table. T