What is the interface type of SMPP Interface ?

{
None,
Api = 1,
Web = 2,
Desktop = 3,
Excel = 4,
TollFreeWidget = 5,
Scheduler = 6,
ExcelPlugin = 7,
SMPP = 8,
XML = 9,
OneToMany = 10,
SmartSms = 11,
EmailToSMS = 12,
SmartSMSScheduled = 13,
Resend = 14
}