FreeCalypso > hg > themwi-system-sw
annotate mgw/gsm2pstn.c @ 108:0d6435808bcd
sip-in: implement 100rel for 180 Ringing response
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Wed, 28 Sep 2022 14:29:10 -0800 |
parents | 3b3f07b112f3 |
children | f062c32a5116 |
rev | line source |
---|---|
103
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
1 /* |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
2 * In this module we implement our RTP gateway function |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
3 * in the GSM to PSTN direction. |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
4 */ |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
5 |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
6 #include <sys/types.h> |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
7 #include <sys/socket.h> |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
8 #include <netinet/in.h> |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
9 #include <stdio.h> |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
10 #include <stdint.h> |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
11 #include <stdlib.h> |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
12 #include <string.h> |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
13 #include <strings.h> |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
14 #include <syslog.h> |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
15 #include <unistd.h> |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
16 #include <gsm.h> /* libgsm dependency */ |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
17 #include "../include/tmgw_ctrl.h" |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
18 #include "../include/tmgw_const.h" |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
19 #include "struct.h" |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
20 #include "select.h" |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
21 #include "int_defs.h" |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
22 |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
23 #define ERR_WRONG_UDP_SRC 0x0001 |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
24 #define ERR_BAD_RTP_PACKET 0x0002 |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
25 #define ERR_SSRC_CHANGE 0x0004 |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
26 #define ERR_SEQ_BREAK 0x0008 |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
27 #define ERR_TSTAMP_BREAK 0x0010 |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
28 |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
29 void |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
30 gsm2pstn_rtp_in(in_fd, ep) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
31 struct endpoint *ep; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
32 { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
33 struct rtp_packet pkt; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
34 struct sockaddr_in sin_from; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
35 socklen_t addrlen; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
36 int16_t seq_delta; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
37 int32_t ts_delta; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
38 int16_t pcm_samples[SAMPLES_PER_FRAME]; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
39 int rc, m_out; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
40 |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
41 addrlen = sizeof(struct sockaddr_in); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
42 rc = recvfrom(in_fd, &pkt, sizeof pkt, 0, |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
43 (struct sockaddr *) &sin_from, &addrlen); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
44 if (rc < 0) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
45 return; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
46 if (sin_from.sin_addr.s_addr != ep->rtp_gsm.remote_addr.sin_addr.s_addr |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
47 || sin_from.sin_port != ep->rtp_gsm.remote_addr.sin_port) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
48 if (!(ep->g2p_err_flags & ERR_WRONG_UDP_SRC)) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
49 syslog(LOG_ERR, |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
50 "GSM RTP ep got UDP packet from wrong source"); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
51 ep->g2p_err_flags |= ERR_WRONG_UDP_SRC; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
52 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
53 return; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
54 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
55 if (rc != ep->gsm_rtp_pkt_size) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
56 bad_rtp_pkt: if (!(ep->g2p_err_flags & ERR_BAD_RTP_PACKET)) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
57 syslog(LOG_ERR, "Rx bad RTP packet on GSM side"); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
58 ep->g2p_err_flags |= ERR_BAD_RTP_PACKET; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
59 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
60 return; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
61 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
62 if (pkt.v_p_x_cc != 0x80) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
63 goto bad_rtp_pkt; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
64 if ((pkt.m_pt & 0x7F) != ep->gsm_payload_type) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
65 goto bad_rtp_pkt; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
66 if ((pkt.payload[0] & 0xF0) != ep->gsm_payload_magic) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
67 goto bad_rtp_pkt; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
68 if (ep->g2p_state && pkt.ssrc != ep->g2p_ssrc) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
69 if (!(ep->g2p_err_flags & ERR_SSRC_CHANGE)) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
70 syslog(LOG_ERR, "GSM RTP stream changed SSRC"); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
71 ep->g2p_err_flags |= ERR_SSRC_CHANGE; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
72 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
73 ep->g2p_state = 0; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
74 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
75 if (ep->g2p_state) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
76 seq_delta = ntohs(pkt.seq) - ep->g2p_last_seq; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
77 ts_delta = ntohl(pkt.tstamp) - ep->g2p_last_ts; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
78 if (seq_delta <= 0) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
79 return; /* discard old or duplicate */ |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
80 if (seq_delta != 1) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
81 if (!(ep->g2p_err_flags & ERR_SEQ_BREAK)) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
82 syslog(LOG_ERR, "GSM RTP stream seq break"); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
83 ep->g2p_err_flags |= ERR_SEQ_BREAK; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
84 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
85 m_out = 1; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
86 } else { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
87 if (ts_delta == SAMPLES_PER_FRAME) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
88 m_out = 0; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
89 else if (ts_delta > 0 && |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
90 ts_delta % SAMPLES_PER_FRAME == 0) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
91 m_out = 1; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
92 else { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
93 if (!(ep->g2p_err_flags & ERR_TSTAMP_BREAK)) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
94 syslog(LOG_ERR, |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
95 "GSM RTP stream tstamp break"); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
96 ep->g2p_err_flags |= ERR_TSTAMP_BREAK; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
97 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
98 m_out = 1; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
99 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
100 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
101 } else |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
102 m_out = 1; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
103 ep->g2p_state = 1; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
104 ep->g2p_ssrc = pkt.ssrc; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
105 ep->g2p_last_ts = ntohl(pkt.tstamp); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
106 ep->g2p_last_seq = ntohs(pkt.seq); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
107 /* actual transcoding and forwarding */ |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
108 if (!(ep->fwd_mode & TMGW_FWD_ENABLE_GSM2PSTN)) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
109 ep->g2p_drop_flag = 1; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
110 return; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
111 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
112 if (ep->g2p_drop_flag) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
113 ep->g2p_drop_flag = 0; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
114 m_out = 1; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
115 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
116 switch (ep->gsm_payload_msg_type) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
117 case GSM_TCHF_FRAME: |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
118 gsm_decode(ep->gsm_decoder_state, pkt.payload, pcm_samples); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
119 break; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
120 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
121 pkt.m_pt = ep->pstn_payload_type; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
122 if (m_out) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
123 pkt.m_pt |= 0x80; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
124 pkt.seq = htons(++ep->g2p_out_seq); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
125 g711_encode_frame(pcm_samples, pkt.payload, ep->pstn_payload_type); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
126 addrlen = sizeof(struct sockaddr_in); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
127 sendto(ep->rtp_pstn.rtp_fd, &pkt, RTP_PACKET_SIZE_PSTN, 0, |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
128 (struct sockaddr *) &ep->rtp_pstn.remote_addr, addrlen); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
129 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
130 |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
131 gsm2pstn_init(ep) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
132 struct endpoint *ep; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
133 { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
134 if (ep->gsm_decoder_state) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
135 return TMGW_RESP_OK; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
136 switch (ep->gsm_payload_msg_type) { |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
137 case GSM_TCHF_FRAME: |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
138 ep->gsm_decoder_state = gsm_create(); |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
139 if (!ep->gsm_decoder_state) |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
140 return TMGW_RESP_ERR_RSRC; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
141 break; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
142 } |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
143 select_handlers[ep->rtp_gsm.rtp_fd] = gsm2pstn_rtp_in; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
144 return TMGW_RESP_OK; |
3b3f07b112f3
mgw: implement GSM to PSTN forwarding
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
145 } |