freetdm: adding variables for ansi outgoing IAMs

freetdm: adding variables for ansi outgoing IAMs
         . added called party number INN variable
           ie. <action application="export" data="freetdm_ss7_cld_inn=0"/>
         . added multiple variables to set User Service Information IE
           variables are :
              ss7_iam_usi_trans_cap
              ss7_iam_usi_code_standard
              ss7_iam_usi_trans_mode
              ss7_iam_usi_trans_rate_0
              ss7_iam_usi_trans_rate_1
              ss7_iam_usi_layer1_ident
              ss7_iam_usi_layer1_prot
              ss7_iam_usi_layer2_ident
              ss7_iam_usi_layer2_prot
              ss7_iam_usi_layer3_ident
              ss7_iam_usi_layer3_prot
              ss7_iam_usi_chan_struct
              ss7_iam_usi_config
              ss7_iam_usi_establish
              ss7_iam_usi_symmetry
              ss7_iam_usi_rate_multiplier

         . ss7_iam_usi_trans_cap is a string variable, the others are all integers
         . ss7_iam_usi_trans_cap has options of :
              - SPEECH
              - UNRESTRICTED
              - RESTRICTED
              - 31KHZ
              - 7KHZ
              - 15KHZ
              - VIDEO
           default value is SPEECH, if the parameter is wrong, set to SPEECH. If not
           set, this field is not present