SWITCH_STANDARD_APP 4102 mod_freetdm/mod_freetdm.c SWITCH_STANDARD_APP(enable_dtmf_function) SWITCH_STANDARD_APP 4121 mod_freetdm/mod_freetdm.c SWITCH_STANDARD_APP(disable_dtmf_function) SWITCH_STANDARD_APP 4140 mod_freetdm/mod_freetdm.c SWITCH_STANDARD_APP(disable_ec_function)