Incoming SMS service allows you to receive messages to SMS-enabled DIDs, and deliver those messages to the pre-configured destinations. Four types of SMS Trunks are supported:
E-mail - this forwarding method allows you to receive SMS messages to your email address.
HTTP - your incoming SMS messages will be delivered to your desginated HTTP endpoint using POST, PUT or GET methods.
SMPP ESME/SMSC - your incoming SMS messages will be delivered to your designated SMPP Gateway. Both SMPP connection types are supported.
Trunk creation and configuration manuals can be found here.