In the following example, assume Party A and Party B are mobile subscribers that are members of an Enterprise hosting enterprise network 150 and that are assigned respective mobile terminals 140 and 141. Party A's mobile number is +1-972-444-1001, and Party A's office number for land-line telephony device 154 deployed in enterprise network 150 is +1 972-555-2001. Further assume Party A's short code, or office extension, is 2001. Party B's mobile terminal 141 number is +1-972-444-1002, Party B's office number for land-line telephony device 155 deployed in enterprise network 150 is +1-972-555-2002, and Party B's short code is 2002.