Changes between Version 1 and Version 2 of PJSIP_Tutorial


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Timestamp:
Jan 8, 2007 1:48:26 AM (18 years ago)
Author:
bennylp
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  • PJSIP_Tutorial

    v1 v2  
    66== A Simple SIP User Agent == 
    77 
    8 Is it possible to create a simple but rather complete SIP user agent, with registration, digest authentication, SDP negotiation, and fully featured media in under than 100 lines of code? 
     8Is it possible to create a simple but rather complete SIP user agent, with registration, digest authentication, SDP negotiation, and fully featured media in under than 100 lines of code? Bear in mind that SIP is quite a complex protocol, and so is managing media is quite complicated. 
    99 
    10 Well, lets see. 
     10Well, turns out it's not quite possible (at least if we want to have a rather responsible and readable code). 
    1111 
    12 {{{ 
    13 #include <pjsua-lib/pjsua.h> 
     12=== Source Code === 
     13Have a look at the '''[/pjsip/docs/html/page_pjsip_sample_simple_pjsuaua_c.htm simple_pjsua.c]''' for complete source code. 
    1414 
    15 #define THIS_FILE   "APP" 
    1615 
    17 static void on_incoming_call(pjsua_acc_id acc_id, pjsua_call_id call_id, 
    18                              pjsip_rx_data *rdata) 
    19 { 
    20     pjsua_call_info ci; 
     16== Extending the Example == 
    2117 
    22     pjsua_call_get_info(call_id, &ci); 
     18The best source information on using the API is of course [/pjsip/docs/html/group__PJSUA__LIB.htm PJSUA-API Reference Manual]. But here are some information about configuring some features. 
    2319 
    24     PJ_LOG(3,(THIS_FILE, "Incoming call from %.*s!!", 
    25                          (int)ci.remote_info.slen, 
    26                          ci.remote_info.ptr)); 
    2720 
    28     // Automatically answer incoming call with 200/OK 
    29     pjsua_call_answer(call_id, 200, NULL, NULL); 
    30 } 
     21=== Supporting STUN === 
    3122 
    32 static void on_call_media_state(pjsua_call_id call_id) 
    33 { 
    34     pjsua_call_info ci; 
     23Just configure {{{stun_config}}} member of [/pjsip/docs/html/structpjsua__transport__config.htm pjsua_transport_config] when creating the UDP transport. 
    3524 
    36     pjsua_call_get_info(call_id, &ci); 
     25=== TCP and TLS Transports === 
    3726 
    38     if (ci.media_status == PJSUA_CALL_MEDIA_ACTIVE) { 
    39         // When media is active, connect call to sound device. 
    40         pjsua_conf_connect(ci.conf_slot, 0); 
    41         pjsua_conf_connect(0, ci.conf_slot); 
    42     } 
    43 } 
     27Just call [/pjsip/docs/html/group__PJSUA__LIB__TRANSPORT.htm#g1c077d205f7df9fae39a179b2fe47533 pjsua_transport_create()] with {{{PJSIP_TRANSPORT_UDP}}} or {{{PJSIP_TRANSPORT_TLS}}} as the transport type. In addition, optional TLS settings can be configured in {{{tls_setting}}} member of [/pjsip/docs/html/structpjsua__transport__config.htm pjsua_transport_config]. 
    4428 
    45 static void on_call_state(pjsua_call_id call_id, pjsip_event *e) 
    46 { 
    47     pjsua_call_info ci; 
    4829 
    49     pjsua_call_get_info(call_id, &ci); 
    50     PJ_LOG(3,(THIS_FILE, "Call %d state=%.*s", call_id, 
    51                          (int)ci.state_text.slen, 
    52                          ci.state_text.ptr)); 
    53 } 
     30=== Supporting SIP SRV Resolution === 
    5431 
    55 static void error_exit(const char *title, pj_status_t status) 
    56 { 
    57     pjsua_perror(THIS_FILE, title, status); 
    58     pjsua_destroy(); 
    59     exit(1); 
    60 } 
     32To enable SIP SRV resolution, configure the {{{nameserver}}} and {{{nameserver_count}}} in [http://www.pjsip.org/pjsip/docs/html/structpjsua__config.htm pjsua_config]. 
    6133 
    62 int main(int argc, char *argv[]) 
    63 { 
    64     pjsua_acc_id acc_id; 
    65     pj_status_t status; 
     34=== Call Conferencing === 
    6635 
    67     // Create pjsua first! 
    68     status = pjsua_create(); 
    69     if (status != PJ_SUCCESS) error_exit("Error in pjsua_create()", status); 
     36Use [http://www.pjsip.org/pjsip/docs/html/group__PJSUA__LIB__MEDIA.htm#g3451304d677e013130dfb9e6b37e3ee6 pjsua_conf_connect()] to connect any channels in the bridge (calls, files, sound device, etc.) When more than two media sources are transmitting to the same sink, the conference bridge will automatically mix the signal from all the sources. 
    7037 
    71     // If argument is specified, it's got to be a valid SIP URL 
    72     if (argc > 1) { 
    73         status = pjsua_verify_sip_url(argv[1]); 
    74         if (status != PJ_SUCCESS) error_exit("Invalid URL in argument", status); 
    75     } 
     38=== Multiple Accounts === 
    7639 
    77     // Init pjsua 
    78     { 
    79         pjsua_config cfg; 
    80         pjsua_logging_config log_cfg; 
     40Just add another account with [http://www.pjsip.org/pjsip/docs/html/group__PJSUA__LIB__ACC.htm#g18ff1b0e9d62682b6d64a321eb0106d8 pjsua_acc_add()]. 
    8141 
    82         pjsua_config_default(&cfg); 
    83         cfg.cb.on_incoming_call = &on_incoming_call; 
    84         cfg.cb.on_call_media_state = &on_call_media_state; 
    85         cfg.cb.on_call_state = &on_call_state; 
    86  
    87         pjsua_logging_config_default(&log_cfg); 
    88         log_cfg.console_level = 4; 
    89  
    90         status = pjsua_init(&cfg, &log_cfg, NULL); 
    91         if (status != PJ_SUCCESS) error_exit("Error in pjsua_init()", status); 
    92     } 
    93  
    94     // Add UDP transport. 
    95     { 
    96         pjsua_transport_config cfg; 
    97  
    98         pjsua_transport_config_default(&cfg); 
    99         cfg.port = 5060; 
    100         status = pjsua_transport_create(PJSIP_TRANSPORT_UDP, &cfg, NULL); 
    101         if (status != PJ_SUCCESS) error_exit("Error creating transport", status); 
    102     } 
    103  
    104     // Initialization is done, now start pjsua 
    105     status = pjsua_start(); 
    106     if (status != PJ_SUCCESS) error_exit("Error starting pjsua", status); 
    107  
    108     // Register to SIP account. 
    109     { 
    110         pjsua_acc_config cfg; 
    111  
    112         pjsua_acc_config_default(&cfg); 
    113         cfg.id = pj_str("sip:bulukucing@iptel.org"); 
    114         cfg.reg_uri = pj_str("sip:iptel.org"); 
    115         cfg.cred_count = 1; 
    116         cfg.cred_info[0].realm = pj_str("iptel.org"); 
    117         cfg.cred_info[0].scheme = pj_str("digest"); 
    118         cfg.cred_info[0].username = pj_str("bulukucing"); 
    119         cfg.cred_info[0].data_type = 0; 
    120         cfg.cred_info[0].data = pj_str("netura"); 
    121  
    122         status = pjsua_acc_add(&cfg, PJ_TRUE, &acc_id); 
    123         if (status != PJ_SUCCESS) error_exit("Error adding account", status); 
    124     } 
    125  
    126     // If URL is specified, make call to the URL. 
    127     if (argc > 1) { 
    128         pj_str_t uri = pj_str(argv[1]); 
    129         status = pjsua_call_make_call(acc_id, &uri, 0, NULL, NULL, NULL); 
    130         if (status != PJ_SUCCESS) error_exit("Error making call", status); 
    131     } 
    132  
    133     // Wait until user press "q" to quit. 
    134     for (;;) { 
    135         char option[10]; 
    136  
    137         puts("Press 'q' to quit"); 
    138         fgets(option, sizeof(option), stdin); 
    139         if (option[0] == 'q') 
    140             break; 
    141     } 
    142  
    143     // Destroy pjsua 
    144     pjsua_destroy(); 
    145  
    146     return 0; 
    147 } 
    148 }}} 
    149