DEFAULT_SERVICE_TYPE

(string, 0 - 5 bytes) Service type to associate with SMS messages generated by the channel. By default, no service type is specified (that is, a zero length string). Some common service types are: CMT (cellular messaging), CPT (cellular paging), VMN (voice mail notification), VMA (voice mail alerting), WAP (wireless application protocol), and USSD (unstructured supplementary data services).