FreeCalypso > hg > themwi-system-sw
annotate sip-in/sip_ack.c @ 87:9e9034ef476c
sip-in: send CONNECT ACK to GSM upon SIP ACK after 200
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 20 Sep 2022 23:20:50 -0800 |
parents | 3e3fbf44f9d7 |
children | 9b87894704eb |
rev | line source |
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sip-in: implement SIP ACK handling
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1 /* |
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2 * Here we implement our handling of SIP ACK, the last step |
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3 * in the 3-way INVITE handshake. |
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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 <netinet/in.h> |
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9 #include <stdio.h> |
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10 #include <stdint.h> |
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11 #include <stdlib.h> |
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12 #include <string.h> |
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13 #include <strings.h> |
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14 #include <syslog.h> |
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15 #include "../libsip/parse.h" |
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16 #include "../libsip/uas_basic.h" |
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17 #include "call.h" |
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18 |
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19 extern struct call *find_call_by_sip_id(); |
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20 |
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21 void |
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22 handle_sip_ack(req, ess, sin) |
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23 struct sip_pkt_rx *req; |
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24 struct uas_parse_hdrs *ess; |
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25 struct sockaddr_in *sin; |
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26 { |
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27 struct call *call; |
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28 |
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29 call = find_call_by_sip_id(ess->call_id); |
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30 if (!call) |
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31 return; /* ignore spurious ACK */ |
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32 /* weed out wrong CSeq */ |
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33 if (ess->cseq_num != call->invite_cseq) |
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34 return; |
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35 switch (call->sip_state) { |
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36 case SIP_STATE_INVITE_200: |
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37 switch (call->overall_state) { |
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38 case OVERALL_STATE_ANSWERED: |
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39 call->sip_state = SIP_STATE_CONNECTED; |
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40 send_mncc_connect_ack(call); |
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41 break; |
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42 case OVERALL_STATE_TEARDOWN: |
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43 initiate_bye(call); |
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44 break; |
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45 default: |
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46 syslog(LOG_CRIT, |
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47 "FATAL: invalid overall state 0x%x on SIP ACK", |
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48 call->overall_state); |
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49 exit(1); |
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50 } |
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51 break; |
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52 case SIP_STATE_INVITE_ERR: |
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53 call->sip_state = SIP_STATE_ENDED; |
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54 break; |
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55 } |
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56 } |