SIP stack written in C. Available under GPL pjsip dev guide architecture diagram PJSip user agent Attributes: local_info+tag, local_contact, call_id Operations: pj_status_t pjsip_ua_init(endpt, param); pj_status_t pjsip_ua_destroy(void); pjsip_module* pjsip_ua_instance(void); pjsip_endpoint* pjsip_ua_get_endpt(ua); PJSip dialog Attributes: state, session_counter, initial_cseq, local_cseq, remote_cseq, route_set, local_info+tag, local_contact, remote_info+tag, remote_contact, next_set Operations: pj_status_t pjsip_dlg_create_uac(ua, local_uri, contact, …); pj_status_t pjsip_dlg_create_uas(ua, rdata, contact, &dlg); … Continue reading PJSIP