FreeCalypso > hg > themwi-system-sw
view sip-in/sip_ack.c @ 96:f24bbfd23c9d
mgw p2g: outgoing seq numbers, forwarding control
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 25 Sep 2022 19:32:27 -0800 |
parents | 9e9034ef476c |
children | 9b87894704eb |
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/* * Here we implement our handling of SIP ACK, the last step * in the 3-way INVITE handshake. */ #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <strings.h> #include <syslog.h> #include "../libsip/parse.h" #include "../libsip/uas_basic.h" #include "call.h" extern struct call *find_call_by_sip_id(); void handle_sip_ack(req, ess, sin) struct sip_pkt_rx *req; struct uas_parse_hdrs *ess; struct sockaddr_in *sin; { struct call *call; call = find_call_by_sip_id(ess->call_id); if (!call) return; /* ignore spurious ACK */ /* weed out wrong CSeq */ if (ess->cseq_num != call->invite_cseq) return; switch (call->sip_state) { case SIP_STATE_INVITE_200: switch (call->overall_state) { case OVERALL_STATE_ANSWERED: call->sip_state = SIP_STATE_CONNECTED; send_mncc_connect_ack(call); break; case OVERALL_STATE_TEARDOWN: initiate_bye(call); break; default: syslog(LOG_CRIT, "FATAL: invalid overall state 0x%x on SIP ACK", call->overall_state); exit(1); } break; case SIP_STATE_INVITE_ERR: call->sip_state = SIP_STATE_ENDED; break; } }