Group PJSUA_LIB_BASE

group PJSUA_LIB_BASE

Basic application creation/initialization, logging configuration, etc.

The base PJSUA API controls PJSUA creation, initialization, and startup, and also provides various auxiliary functions.

Using PJSUA Library

Creating PJSUA

Before anything else, application must create PJSUA by calling pjsua_create(). This, among other things, will initialize PJLIB, which is crucial before any PJLIB functions can be called, PJLIB-UTIL, and create a SIP endpoint.

After this function is called, application can create a memory pool (with pjsua_pool_create()) and read configurations from command line or file to build the settings to initialize PJSUA below.

Initializing PJSUA

After PJSUA is created, application can initialize PJSUA by calling pjsua_init(). This function takes several optional configuration settings in the argument, if application wants to set them.

PJSUA-LIB Initialization (in C)

Sample code to initialize PJSUA in C code: 

#include <pjsua-lib/pjsua.h>

#define THIS_FILE  __FILE__

static pj_status_t app_init(void)
{
   pjsua_config  ua_cfg;
   pjsua_logging_config log_cfg;
   pjsua_media_config   media_cfg;
   pj_status_t status;

   // Must create pjsua before anything else!
   status = pjsua_create();
   if (status != PJ_SUCCESS) {
       pjsua_perror(THIS_FILE, "Error initializing pjsua", status);
       return status;
   }

   // Initialize configs with default settings.
   pjsua_config_default(&ua_cfg);
   pjsua_logging_config_default(&log_cfg);
   pjsua_media_config_default(&media_cfg);

   // At the very least, application would want to override
   // the call callbacks in pjsua_config:
   ua_cfg.cb.on_incoming_call = ...
   ua_cfg.cb.on_call_state = ..
   ...

   // Customize other settings (or initialize them from application specific
   // configuration file):
   ...

   // Initialize pjsua
   status = pjsua_init(&ua_cfg, &log_cfg, &media_cfg);
   if (status != PJ_SUCCESS) {
         pjsua_perror(THIS_FILE, "Error initializing pjsua", status);
         return status;
   }
   .
   ...
}

Other Initialization

After PJSUA is initialized with pjsua_init(), application will normally need/want to perform the following tasks:

Starting PJSUA

After all initializations have been done, application must call pjsua_start() to start PJSUA. This function will check that all settings have been properly configured, and apply default settings when they haven’t, or report error status when it is unable to recover from missing settings.

Most settings can be changed during run-time. For example, application may add, modify, or delete accounts, buddies, or change media settings during run-time.

C Example for Starting PJSUA

Sample code: 

static pj_status_t app_run(void)
{
   pj_status_t status;

   // Start pjsua
   status = pjsua_start();
   if (status != PJ_SUCCESS) {
       pjsua_destroy();
       pjsua_perror(THIS_FILE, "Error starting pjsua", status);
       return status;
   }

   // Run application loop
   while (1) {
       char choice[10];
       
       printf("Select menu: ");
       fgets(choice, sizeof(choice), stdin);
       ...
   }
}

Defines

PJSUA_INVALID_ID

Constant to identify invalid ID for all sorts of IDs.

PJSUA_ACC_MAX_PROXIES

Maximum proxies in account.

PJSUA_DEFAULT_USE_SRTP

Default value of SRTP mode usage. Valid values are PJMEDIA_SRTP_DISABLED, PJMEDIA_SRTP_OPTIONAL, and PJMEDIA_SRTP_MANDATORY.

PJSUA_DEFAULT_SRTP_SECURE_SIGNALING

Default value of secure signaling requirement for SRTP. Valid values are: 0: SRTP does not require secure signaling 1: SRTP requires secure transport such as TLS 2: SRTP requires secure end-to-end transport (SIPS)

PJSUA_ADD_ICE_TAGS

Controls whether PJSUA-LIB should add ICE media feature tag parameter (the “;+sip.ice” parameter) to Contact header if ICE is enabled in the config.

Default: 1

PJSUA_ACQUIRE_CALL_TIMEOUT

Timeout value used to acquire mutex lock on a particular call.

Default: 2000 ms

pjsip_cred_dup

The implementation has been moved to sip_auth.h

Typedefs

typedef int pjsua_call_id

Call identification

typedef int pjsua_acc_id

Account identification

typedef int pjsua_buddy_id

Buddy identification

typedef int pjsua_player_id

File player identification

typedef int pjsua_recorder_id

File recorder identification

typedef int pjsua_conf_port_id

Conference port identification

typedef void (*pj_stun_resolve_cb)(const pj_stun_resolve_result *result)

Typedef of callback to be registered to pjsua_resolve_stun_servers().

Enums

enum pjsua_create_media_transport_flag

This enumeration specifies the options for custom media transport creation.

Values:

enumerator PJSUA_MED_TP_CLOSE_MEMBER

This flag indicates that the media transport must also close its “member” or “child” transport when pjmedia_transport_close() is called. If this flag is not specified, then the media transport must not call pjmedia_transport_close() of its member transport.

enum pjsua_sip_timer_use

This enumeration specifies the usage of SIP Session Timers extension.

Values:

enumerator PJSUA_SIP_TIMER_INACTIVE

When this flag is specified, Session Timers will not be used in any session, except it is explicitly required in the remote request.

enumerator PJSUA_SIP_TIMER_OPTIONAL

When this flag is specified, Session Timers will be used in all sessions whenever remote supports and uses it.

enumerator PJSUA_SIP_TIMER_REQUIRED

When this flag is specified, Session Timers support will be a requirement for the remote to be able to establish a session.

enumerator PJSUA_SIP_TIMER_ALWAYS

When this flag is specified, Session Timers will always be used in all sessions, regardless whether remote supports/uses it or not.

enum pjsua_100rel_use

This constants controls the use of 100rel extension.

Values:

enumerator PJSUA_100REL_NOT_USED

Not used. For UAC, support for 100rel will be indicated in Supported header so that peer can opt to use it if it wants to. As UAS, this option will NOT cause 100rel to be used even if UAC indicates that it supports this feature.

enumerator PJSUA_100REL_MANDATORY

Mandatory. UAC will place 100rel in Require header, and UAS will reject incoming calls unless it has 100rel in Supported header.

enumerator PJSUA_100REL_OPTIONAL

Optional. Similar to PJSUA_100REL_NOT_USED, except that as UAS, this option will cause 100rel to be used if UAC indicates that it supports it.

enum pjsua_destroy_flag

Flags to be given to pjsua_destroy2()

Values:

enumerator PJSUA_DESTROY_NO_RX_MSG

Allow sending outgoing messages (such as unregistration, event unpublication, BYEs, unsubscription, etc.), but do not wait for responses. This is useful to perform “best effort” clean up without delaying the shutdown process waiting for responses.

enumerator PJSUA_DESTROY_NO_TX_MSG

If this flag is set, do not send any outgoing messages at all. This flag is useful if application knows that the network which the messages are to be sent on is currently down.

enumerator PJSUA_DESTROY_NO_NETWORK

Do not send or receive messages during destroy. This flag is shorthand for PJSUA_DESTROY_NO_RX_MSG + PJSUA_DESTROY_NO_TX_MSG.

Functions

void pjsua_logging_config_default(pjsua_logging_config *cfg)

Use this function to initialize logging config.

Parameters

cfg – The logging config to be initialized.

void pjsua_logging_config_dup(pj_pool_t *pool, pjsua_logging_config *dst, const pjsua_logging_config *src)

Use this function to duplicate logging config.

Parameters

  • pool – Pool to use.

  • dst – Destination config.

  • src – Source config.

void pjsua_config_default(pjsua_config *cfg)

Use this function to initialize pjsua config.

Parameters

cfg – pjsua config to be initialized.

void pjsua_config_dup(pj_pool_t *pool, pjsua_config *dst, const pjsua_config *src)

Duplicate pjsua_config.

Parameters

  • pool – The pool to get memory from.

  • dst – Destination config.

  • src – Source config.

void pjsua_msg_data_init(pjsua_msg_data *msg_data)

Initialize message data.

Parameters

msg_data – Message data to be initialized.

pj_status_t pjsua_create(void)

Instantiate pjsua application. Application must call this function before calling any other functions, to make sure that the underlying libraries are properly initialized. Once this function has returned success, application must call pjsua_destroy() before quitting.

Returns

PJ_SUCCESS on success, or the appropriate error code.

pj_status_t pjsua_init(const pjsua_config *ua_cfg, const pjsua_logging_config *log_cfg, const pjsua_media_config *media_cfg)

Initialize pjsua with the specified settings. All the settings are optional, and the default values will be used when the config is not specified.

Note that pjsua_create() MUST be called before calling this function.

Parameters

  • ua_cfg – User agent configuration.

  • log_cfg – Optional logging configuration.

  • media_cfg – Optional media configuration.

Returns

PJ_SUCCESS on success, or the appropriate error code.

pj_status_t pjsua_start(void)

Application is recommended to call this function after all initialization is done, so that the library can do additional checking set up additional

Application may call this function anytime after pjsua_init().

Returns

PJ_SUCCESS on success, or the appropriate error code.

pj_status_t pjsua_destroy(void)

Destroy pjsua. Application is recommended to perform graceful shutdown before calling this function (such as unregister the account from the SIP server, terminate presense subscription, and hangup active calls), however, this function will do all of these if it finds there are active sessions that need to be terminated. This function will approximately block for one second to wait for replies from remote.

Application.may safely call this function more than once if it doesn’t keep track of it’s state.

See

pjsua_destroy2()

Returns

PJ_SUCCESS on success, or the appropriate error code.

pj_status_t pjsua_destroy2(unsigned flags)

Variant of destroy with additional flags.

Parameters

flags – Combination of pjsua_destroy_flag enumeration.

Returns

PJ_SUCCESS on success, or the appropriate error code.

int pjsua_handle_events(unsigned msec_timeout)

Poll pjsua for events, and if necessary block the caller thread for the specified maximum interval (in miliseconds).

Application doesn’t normally need to call this function if it has configured worker thread (thread_cnt field) in pjsua_config structure, because polling then will be done by these worker threads instead.

Parameters

msec_timeout – Maximum time to wait, in miliseconds.

Returns

The number of events that have been handled during the poll. Negative value indicates error, and application can retrieve the error as (status = -return_value).

pj_pool_t *pjsua_pool_create(const char *name, pj_size_t init_size, pj_size_t increment)

Create memory pool to be used by the application. Once application finished using the pool, it must be released with pj_pool_release().

Parameters

  • name – Optional pool name.

  • init_size – Initial size of the pool.

  • increment – Increment size.

Returns

The pool, or NULL when there’s no memory.

pj_status_t pjsua_reconfigure_logging(const pjsua_logging_config *c)

Application can call this function at any time (after pjsua_create(), of course) to change logging settings.

Parameters

c – Logging configuration.

Returns

PJ_SUCCESS on success, or the appropriate error code.

pjsip_endpoint *pjsua_get_pjsip_endpt(void)

Internal function to get SIP endpoint instance of pjsua, which is needed for example to register module, create transports, etc. Only valid after pjsua_init() is called.

Returns

SIP endpoint instance.

pjmedia_endpt *pjsua_get_pjmedia_endpt(void)

Internal function to get media endpoint instance. Only valid after pjsua_init() is called.

Returns

Media endpoint instance.

pj_pool_factory *pjsua_get_pool_factory(void)

Internal function to get PJSUA pool factory. Only valid after pjsua_create() is called.

Returns

Pool factory currently used by PJSUA.

pj_status_t pjsua_detect_nat_type(void)

This is a utility function to detect NAT type in front of this endpoint. Once invoked successfully, this function will complete asynchronously and report the result in on_nat_detect() callback of pjsua_callback.

After NAT has been detected and the callback is called, application can get the detected NAT type by calling pjsua_get_nat_type(). Application can also perform NAT detection by calling pjsua_detect_nat_type() again at later time.

Note that STUN must be enabled to run this function successfully.

Returns

PJ_SUCCESS on success, or the appropriate error code.

pj_status_t pjsua_get_nat_type(pj_stun_nat_type *type)

Get the NAT type as detected by pjsua_detect_nat_type() function. This function will only return useful NAT type after pjsua_detect_nat_type() has completed successfully and on_nat_detect() callback has been called.

See

pjsua_call_get_rem_nat_type()

Parameters

type – NAT type.

Returns

When detection is in progress, this function will return PJ_EPENDING and type will be set to PJ_STUN_NAT_TYPE_UNKNOWN. After NAT type has been detected successfully, this function will return PJ_SUCCESS and type will be set to the correct value. Other return values indicate error and type will be set to PJ_STUN_NAT_TYPE_ERR_UNKNOWN.

pj_status_t pjsua_resolve_stun_servers(unsigned count, pj_str_t srv[], pj_bool_t wait, void *token, pj_stun_resolve_cb cb)

Auxiliary function to resolve and contact each of the STUN server entries (sequentially) to find which is usable. The pjsua_init() must have been called before calling this function.

Parameters

  • count – Number of STUN server entries to try.

  • srv – Array of STUN server entries to try. Please see the stun_srv field in the pjsua_config documentation about the format of this entry.

  • wait – Specify non-zero to make the function block until it gets the result. In this case, the function will block while the resolution is being done, and the callback will be called before this function returns.

  • token – Arbitrary token to be passed back to application in the callback.

  • cb – Callback to be called to notify the result of the function.

Returns

If wait parameter is non-zero, this will return PJ_SUCCESS if one usable STUN server is found. Otherwise it will always return PJ_SUCCESS, and application will be notified about the result in the callback.

pj_status_t pjsua_cancel_stun_resolution(void *token, pj_bool_t notify_cb)

Cancel pending STUN resolution which match the specified token.

Parameters

  • token – The token to match. This token was given to pjsua_resolve_stun_servers()

  • notify_cb – Boolean to control whether the callback should be called for cancelled resolutions. When the callback is called, the status in the result will be set as PJ_ECANCELLED.

Returns

PJ_SUCCESS if there is at least one pending STUN resolution cancelled, or PJ_ENOTFOUND if there is no matching one, or other error.

pj_status_t pjsua_verify_sip_url(const char *url)

This is a utility function to verify that valid SIP url is given. If the URL is a valid SIP/SIPS scheme, PJ_SUCCESS will be returned.

See

pjsua_verify_url()

Parameters

url – The URL, as NULL terminated string.

Returns

PJ_SUCCESS on success, or the appropriate error code.

pj_status_t pjsua_verify_url(const char *url)

This is a utility function to verify that valid URI is given. Unlike pjsua_verify_sip_url(), this function will return PJ_SUCCESS if tel: URI is given.

See

pjsua_verify_sip_url()

Parameters

url – The URL, as NULL terminated string.

Returns

PJ_SUCCESS on success, or the appropriate error code.

pj_status_t pjsua_schedule_timer(pj_timer_entry *entry, const pj_time_val *delay)

Schedule a timer entry. Note that the timer callback may be executed by different thread, depending on whether worker thread is enabled or not.

See

pjsip_endpt_schedule_timer()

Parameters

  • entry – Timer heap entry.

  • delay – The interval to expire.

Returns

PJ_SUCCESS on success, or the appropriate error code.

void pjsua_cancel_timer(pj_timer_entry *entry)

Cancel the previously scheduled timer.

See

pjsip_endpt_cancel_timer()

Parameters

entry – Timer heap entry.

void pjsua_perror(const char *sender, const char *title, pj_status_t status)

This is a utility function to display error message for the specified error code. The error message will be sent to the log.

Parameters

  • sender – The log sender field.

  • title – Message title for the error.

  • status – Status code.

void pjsua_dump(pj_bool_t detail)

This is a utility function to dump the stack states to log, using verbosity level 3.

Parameters

detail – Will print detailed output (such as list of SIP transactions) when non-zero.

struct pjsua_logging_config
#include <pjsua.h>

Logging configuration, which can be (optionally) specified when calling pjsua_init(). Application must call pjsua_logging_config_default() to initialize this structure with the default values.

struct pjsua_mwi_info
#include <pjsua.h>

Structure to be passed on MWI callback.

struct pjsua_reg_info
#include <pjsua.h>

Structure to be passed on registration callback.

struct pjsua_callback
#include <pjsua.h>

This structure describes application callback to receive various event notification from PJSUA-API. All of these callbacks are OPTIONAL, although definitely application would want to implement some of the important callbacks (such as on_incoming_call).

struct pjsua_config
#include <pjsua.h>

This structure describes the settings to control the API and user agent behavior, and can be specified when calling pjsua_init(). Before setting the values, application must call pjsua_config_default() to initialize this structure with the default values.

struct pjsua_msg_data
#include <pjsua.h>

This structure describes additional information to be sent with outgoing SIP message. It can (optionally) be specified for example with pjsua_call_make_call(), pjsua_call_answer(), pjsua_call_hangup(), pjsua_call_set_hold(), pjsua_call_send_im(), and many more.

Application MUST call pjsua_msg_data_init() to initialize this structure before setting its values.

Forward declaration for pjsua_msg_data

struct pj_stun_resolve_result
#include <pjsua.h>

This structure is used to represent the result of the STUN server resolution and testing, the pjsua_resolve_stun_servers() function. This structure will be passed in pj_stun_resolve_cb callback.