freetdm: Added CAS hangup bit checking to the E&M signaling module

diff --git a/libs/freetdm/src/ftmod/ftmod_analog_em/ftmod_analog_em.c b/libs/freetdm/src/ftmod/ftmod_analog_em/ftmod_analog_em.c
index 78f4bb38a1029c6d7f07828e5b20eea9a7062ab5..8cf43bbdfd9820a241eb72376c953405b577aac1 100644 (file)
--- a/libs/freetdm/src/ftmod/ftmod_analog_em/ftmod_analog_em.c
+++ b/libs/freetdm/src/ftmod/ftmod_analog_em/ftmod_analog_em.c
@@ -483,7 +483,9 @@ static void *ftdm_analog_em_channel_run(ftdm_thread_t *me, void *obj)
        ftdm_sigmsg_t sig;
        int cas_bits = 0;
        uint32_t cas_answer = 0;
+       uint32_t cas_hangup = 0;
        int cas_answer_ms = 500;
+       int cas_hangup_ms = 500;
        FILE *ringback_f = NULL;
        ftdm_bool_t digits_sent = FTDM_FALSE;
 
@@ -641,6 +643,23 @@ static void *ftdm_analog_em_channel_run(ftdm_thread_t *me, void *obj)
                        case FTDM_CHANNEL_STATE_RING:
                                {
                                        ftdm_sleep(interval);
+                                       if (ftdmchan->state == FTDM_CHANNEL_STATE_UP && cas_answer) {
+                                               cas_bits = 0;
+                                               ftdm_channel_command(ftdmchan, FTDM_COMMAND_GET_CAS_BITS, &cas_bits);
+                                               if (!(state_counter % 5000)) {
+                                                       ftdm_log_chan(ftdmchan, FTDM_LOG_DEBUG, "CAS bits: 0x%X\n", cas_bits);
+                                               }
+                                               if (cas_bits == 0x0) {
+                                                       cas_hangup += interval;
+                                                       if (cas_hangup >= cas_hangup_ms) {
+                                                               ftdm_log_chan_msg(ftdmchan, FTDM_LOG_INFO, "Hanging up on CAS hangup signal persistence\n");
+                                                               ftdm_set_state_locked(ftdmchan, FTDM_CHANNEL_STATE_HANGUP);
+                                                       }
+                                               } else if (cas_hangup) {
+                                                       ftdm_log_chan(ftdmchan, FTDM_LOG_DEBUG, "Resetting cas hangup to 0: 0x%X!\n", cas_bits);
+                                                       cas_hangup = 0;
+                                               }
+                                       }
                                        continue;
                                }
                                break;