This object specifies the server type as follows.
'esme' - Indicates this result group represents an external
short message entity (ESME). Coding this parameter
will allow the user to enter ESME specific
parameters and enable the Distributed Short Message
Routing to properly characterize the routing of the
message.
'smsc' - Indicates this result group represents a short
message service center (SMSC). Coding this
parameter will allow the user to enter SMSC
specific parameters and enable the Distributed
Short Message Routing to properly characterize
the routing of the message.