FreeCalypso > hg > themwi-system-sw
annotate mgw/gsm2pstn.c @ 168:8c28426abef0
mgw: start using the new libgsmfrp dependency
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 19 Nov 2022 22:57:59 -0800 |
parents | f062c32a5116 |
children | 648a64b2e16b |
rev | line source |
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1 /* |
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2 * In this module we implement our RTP gateway function |
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3 * in the GSM to PSTN direction. |
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4 */ |
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5 |
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6 #include <sys/types.h> |
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7 #include <sys/socket.h> |
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8 #include <sys/time.h> |
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9 #include <netinet/in.h> |
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10 #include <stdio.h> |
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11 #include <stdint.h> |
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12 #include <stdlib.h> |
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13 #include <string.h> |
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14 #include <strings.h> |
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15 #include <syslog.h> |
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16 #include <unistd.h> |
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17 #include <gsm.h> /* libgsm dependency */ |
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18 #include <gsm_fr_preproc.h> |
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19 #include "../include/tmgw_ctrl.h" |
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20 #include "../include/tmgw_const.h" |
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21 #include "struct.h" |
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22 #include "select.h" |
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23 #include "int_defs.h" |
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24 |
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25 extern struct timeval cur_event_time; |
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26 |
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27 #define ERR_WRONG_UDP_SRC 0x0001 |
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28 #define ERR_BAD_RTP_PACKET 0x0002 |
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29 #define ERR_SSRC_CHANGE 0x0004 |
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30 #define ERR_SEQ_BREAK 0x0008 |
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31 #define ERR_TSTAMP_BREAK 0x0010 |
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32 |
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33 void |
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34 gsm2pstn_rtp_in(in_fd, ep) |
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35 struct endpoint *ep; |
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36 { |
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37 struct rtp_packet pkt; |
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38 struct sockaddr_in sin_from; |
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39 socklen_t addrlen; |
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40 int16_t seq_delta; |
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41 int32_t ts_delta; |
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42 int16_t pcm_samples[SAMPLES_PER_FRAME]; |
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43 int rc, m_out; |
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44 |
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45 addrlen = sizeof(struct sockaddr_in); |
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46 rc = recvfrom(in_fd, &pkt, sizeof pkt, 0, |
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47 (struct sockaddr *) &sin_from, &addrlen); |
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48 if (rc < 0) |
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49 return; |
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50 if (sin_from.sin_addr.s_addr != ep->rtp_gsm.remote_addr.sin_addr.s_addr |
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51 || sin_from.sin_port != ep->rtp_gsm.remote_addr.sin_port) { |
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52 if (!(ep->g2p_err_flags & ERR_WRONG_UDP_SRC)) { |
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53 syslog(LOG_ERR, |
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54 "GSM RTP ep got UDP packet from wrong source"); |
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55 ep->g2p_err_flags |= ERR_WRONG_UDP_SRC; |
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56 } |
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57 return; |
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58 } |
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59 if (rc != ep->gsm_rtp_pkt_size) { |
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60 bad_rtp_pkt: if (!(ep->g2p_err_flags & ERR_BAD_RTP_PACKET)) { |
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61 syslog(LOG_ERR, "Rx bad RTP packet on GSM side"); |
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62 ep->g2p_err_flags |= ERR_BAD_RTP_PACKET; |
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63 } |
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64 return; |
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65 } |
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66 if (pkt.v_p_x_cc != 0x80) |
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67 goto bad_rtp_pkt; |
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68 if ((pkt.m_pt & 0x7F) != ep->gsm_payload_type) |
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69 goto bad_rtp_pkt; |
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70 if ((pkt.payload[0] & 0xF0) != ep->gsm_payload_magic) |
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71 goto bad_rtp_pkt; |
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72 if (ep->g2p_state && pkt.ssrc != ep->g2p_ssrc) { |
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73 if (!(ep->g2p_err_flags & ERR_SSRC_CHANGE)) { |
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74 syslog(LOG_ERR, "GSM RTP stream changed SSRC"); |
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75 ep->g2p_err_flags |= ERR_SSRC_CHANGE; |
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76 } |
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77 ep->g2p_state = 0; |
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78 if (ep->dtmf_pp) |
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79 dtmf_stop_immediate(ep); |
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80 } |
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81 if (ep->g2p_state) { |
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82 seq_delta = ntohs(pkt.seq) - ep->g2p_last_seq; |
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83 ts_delta = ntohl(pkt.tstamp) - ep->g2p_last_ts; |
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84 if (seq_delta <= 0) |
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85 return; /* discard old or duplicate */ |
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86 if (seq_delta != 1) { |
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87 if (!(ep->g2p_err_flags & ERR_SEQ_BREAK)) { |
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88 syslog(LOG_ERR, "GSM RTP stream seq break"); |
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89 ep->g2p_err_flags |= ERR_SEQ_BREAK; |
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90 } |
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91 m_out = 1; |
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92 } else { |
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93 if (ts_delta == SAMPLES_PER_FRAME) |
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94 m_out = 0; |
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95 else if (ts_delta > 0 && |
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96 ts_delta % SAMPLES_PER_FRAME == 0) |
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97 m_out = 1; |
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98 else { |
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99 if (!(ep->g2p_err_flags & ERR_TSTAMP_BREAK)) { |
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100 syslog(LOG_ERR, |
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101 "GSM RTP stream tstamp break"); |
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102 ep->g2p_err_flags |= ERR_TSTAMP_BREAK; |
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103 } |
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104 m_out = 1; |
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105 } |
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106 } |
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107 } else |
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108 m_out = 1; |
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109 ep->g2p_state = 1; |
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110 ep->g2p_ssrc = pkt.ssrc; |
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111 ep->g2p_last_ts = ntohl(pkt.tstamp); |
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112 ep->g2p_last_seq = ntohs(pkt.seq); |
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113 ep->g2p_local_time = cur_event_time; |
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114 /* actual transcoding and forwarding */ |
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115 if (!(ep->fwd_mode & TMGW_FWD_ENABLE_GSM2PSTN)) { |
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116 ep->g2p_drop_flag = 1; |
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117 return; |
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118 } |
127
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119 if (ep->dtmf_pp) |
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120 return; |
103
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121 if (ep->g2p_drop_flag) { |
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122 ep->g2p_drop_flag = 0; |
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123 m_out = 1; |
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124 } |
127
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125 if (ep->dtmf_aftermath) { |
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126 ts_delta = ep->g2p_last_ts - ep->dtmf_last_ts; |
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127 if (ts_delta <= 0) |
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128 return; |
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129 ep->dtmf_aftermath = 0; |
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130 if (ts_delta == SAMPLES_PER_FRAME) |
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131 m_out = 0; |
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132 else |
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133 m_out = 1; |
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134 } |
103
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135 switch (ep->gsm_payload_msg_type) { |
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136 case GSM_TCHF_FRAME: |
168
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137 gsmfr_preproc_good_frame(ep->gsm_decoder_extra_state, |
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138 pkt.payload); |
103
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139 gsm_decode(ep->gsm_decoder_state, pkt.payload, pcm_samples); |
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140 break; |
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141 } |
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142 pkt.m_pt = ep->pstn_payload_type; |
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143 if (m_out) |
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144 pkt.m_pt |= 0x80; |
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145 pkt.seq = htons(++ep->g2p_out_seq); |
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146 g711_encode_frame(pcm_samples, pkt.payload, ep->pstn_payload_type); |
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147 addrlen = sizeof(struct sockaddr_in); |
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148 sendto(ep->rtp_pstn.rtp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0, |
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149 (struct sockaddr *) &ep->rtp_pstn.remote_addr, addrlen); |
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150 } |
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151 |
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152 gsm2pstn_init(ep) |
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153 struct endpoint *ep; |
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154 { |
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155 if (ep->gsm_decoder_state) |
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156 return TMGW_RESP_OK; |
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157 switch (ep->gsm_payload_msg_type) { |
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158 case GSM_TCHF_FRAME: |
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159 ep->gsm_decoder_state = gsm_create(); |
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160 if (!ep->gsm_decoder_state) |
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161 return TMGW_RESP_ERR_RSRC; |
168
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162 ep->gsm_decoder_extra_state = gsmfr_preproc_create(); |
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163 if (!ep->gsm_decoder_extra_state) { |
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164 free(ep->gsm_decoder_state); |
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165 ep->gsm_decoder_state = 0; |
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166 return TMGW_RESP_ERR_RSRC; |
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167 } |
103
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168 break; |
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169 } |
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170 select_handlers[ep->rtp_gsm.rtp_fd] = gsm2pstn_rtp_in; |
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171 return TMGW_RESP_OK; |
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172 } |