{"id":1166,"date":"2022-06-23T09:19:37","date_gmt":"2022-06-23T07:19:37","guid":{"rendered":"https:\/\/blog.beevoip.it\/?p=1166"},"modified":"2024-02-03T10:18:57","modified_gmt":"2024-02-03T09:18:57","slug":"protocollo-sip-il-metodo-refer","status":"publish","type":"post","link":"https:\/\/www.beevoip.it\/blog\/protocollo-sip-il-metodo-refer\/","title":{"rendered":"SIP: il metodo REFER"},"content":{"rendered":"\n

A cosa serve il metodo REFER<\/strong><\/h3>\n\n\n\n

Nel SIP utilizziamo il metodo REFER (introdotto con l’RFC3515<\/a>) per molte applicazioni, ma principalmente per il trasferimento delle chiamate.<\/p>\n\n\n\n

Per capirne meglio il funzionamento, abbiamo simulato uno scenario molto comune:<\/p>\n\n\n\n

    \n
  1. Cellulare chiama un numero registrato sul centralino<\/li>\n\n\n\n
  2. Interno 254 risponde ed inoltra la chiamata all’interno 253<\/li>\n\n\n\n
  3. L’interno 253 \u00e8 ora in contatto con il cellulare che ha chiamato.<\/li>\n<\/ol>\n\n\n\n

    Dal flusso che segue, catturato tramite Wireshark, possiamo notare dal flusso in rosa che il cellulare (con IP 185.xx.yy.3) che chiama il centralino (IP 192.xx.yy.243) e digita 254 per mettersi in contatto con quel determinato interno.<\/p>\n\n\n\n

    I flussi in azzurro sono invece le comunicazioni tra gli interni ed il centralino. Nei primi 5 flussi viene stabilita la sessione tra cellulare e interno 254, mentre nel flusso dopo l’RTP in rosa vediamo un INVITE, ovvero quando il 254 prova a chiamare il 253. Dopo che i due interni hanno stabilito la sessione tra loro, il 254 invia un REFER al centralino, per dire di trasferire la chiamata al 253.<\/p>\n\n\n

    \n
    \"Flusso
    Flusso SIP metodo REFER<\/figcaption><\/figure>\n<\/div>\n\n\n

    Com’\u00e8 composto?<\/h3>\n\n\n
    \n
    \"Pacchetto
    Pacchetto REFER<\/figcaption><\/figure>\n<\/div>\n\n\n

    I campi che ci interessano in questo pacchetto sono “From”, “To” e “Refer-To”<\/p>\n\n\n\n

    Il campo “From” indica chi ha richiesto il trasferimento di chiamata, in questo caso il 254.
    “To” indica la sessione da trasferire e “Refer-To” specifica a quale interno trasferire la chiamata.<\/p>\n\n\n\n

    Per conoscere gli altri metodi, fondamentali e di estensione, puoi andare nell\u2019apposita sezione: Metodi SIP<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Nel SIP utilizziamo il metodo REFER per molte applicazioni, ma principalmente per il trasferimento delle chiamate.<\/p>\n","protected":false},"author":4,"featured_media":3542,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"video","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[7],"tags":[27],"class_list":["post-1166","post","type-post","status-publish","format-video","has-post-thumbnail","category-voip","tag-metodi-sip","post_format-post-format-video"],"yoast_head":"\nSIP: il metodo REFER - Blog Beevoip<\/title>\n<meta name=\"description\" content=\"Nel SIP utilizziamo il metodo REFER per molte applicazioni, ma principalmente per il trasferimento delle chiamate.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.beevoip.it\/blog\/protocollo-sip-il-metodo-refer\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SIP: il metodo REFER - 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