{"id":483,"date":"2022-04-14T08:56:44","date_gmt":"2022-04-14T06:56:44","guid":{"rendered":"https:\/\/blog.beevoip.it\/?p=483"},"modified":"2022-04-14T08:59:06","modified_gmt":"2022-04-14T06:59:06","slug":"nat-e-voip-sip-una-convivenza-difficile-parte-09","status":"publish","type":"post","link":"https:\/\/www.beevoip.it\/blog\/nat-e-voip-sip-una-convivenza-difficile-parte-09\/","title":{"rendered":"NAT E VOIP: Una convivenza difficile &#8211; parte 9"},"content":{"rendered":"\n<p>NAT E VOIP: SIP, SDP E RTP &#8211; PROBLEMI<\/p>\n\n\n\n<p><br>SIP utilizza molto spesso gli indirizzi IP nei propri headers, un esempio significativo \u00e8 il metodo REGISTER.<\/p>\n\n\n\n<p><br>La richiesta di registrazione viene effettuata da un telefono per rendersi raggiungibile dal SIP proxy, a tale scopo viene utilizzato l\u2019header Contact il quale viene compilato con IP e porta su cui il telefono deve ricevere le richieste SIP (ad es. le INVITE per le chiamate in ingresso).<\/p>\n\n\n\n<p><br>L\u2019header Contact verr\u00e0 compilato con l\u2019IP del telefono che, nel caso di un telefono in una LAN, sar\u00e0 un IP privato.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>NAT E VOIP: SIP, SDP &#8211; HANDS ON<br>\u25b8 Register inviata dal telefono:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"724\" height=\"542\" src=\"https:\/\/blog.beevoip.it\/wp-content\/uploads\/2022\/03\/image-7.png\" alt=\"Analisi pacchetto Register pcap\" class=\"wp-image-484\" srcset=\"https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-7.png 724w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-7-300x225.png 300w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-7-696x521.png 696w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-7-561x420.png 561w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-7-80x60.png 80w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-7-265x198.png 265w\" sizes=\"auto, (max-width: 724px) 100vw, 724px\" \/><\/figure>\n\n\n\n<p>NAT E VOIP: SIP, SDP &#8211; HANDS ON<br>\u25b8 Register ricevuta dal PBX:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"777\" height=\"562\" src=\"https:\/\/blog.beevoip.it\/wp-content\/uploads\/2022\/03\/image-8.png\" alt=\"Analisi pacchetto Register dopo attraversamento NAT\" class=\"wp-image-485\" srcset=\"https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-8.png 777w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-8-300x217.png 300w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-8-768x555.png 768w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-8-696x503.png 696w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-8-581x420.png 581w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-8-324x235.png 324w\" sizes=\"auto, (max-width: 777px) 100vw, 777px\" \/><\/figure>\n\n\n\n<p>NAT E VOIP: SIP, SDP &#8211; HANDS ON<br>\u25b8 SDP:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"991\" height=\"486\" src=\"https:\/\/blog.beevoip.it\/wp-content\/uploads\/2022\/03\/image-9.png\" alt=\"sip SDP con NAT\" class=\"wp-image-486\" srcset=\"https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-9.png 991w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-9-300x147.png 300w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-9-768x377.png 768w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-9-696x341.png 696w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-9-856x420.png 856w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-9-324x160.png 324w, https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/03\/image-9-533x261.png 533w\" sizes=\"auto, (max-width: 991px) 100vw, 991px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">IL PROBLEMA CON RTP<\/h2>\n\n\n\n<p><br>Un\u2019altra problematica introdotta dal NAT \u00e8 legata alla negoziazione dinamica delle porte RTP<\/p>\n\n\n\n<p><br>Durante lo stabilirsi di una chiamata tramite i messaggi SIP INVITE e 200 OK gli endpoint, tramite una sintassi SDP, negoziano indirizzi IP e porte da utilizzare per l\u2019invio dello stream audio.<br>Gli indirizzi IP generalmente sono gli IP dei due endpoint (ma non \u00e8 garantito: potrebbe essere negoziato l\u2019uso di un media server ad esempio), le porte vengono negoziate dinamicamente e non sono predicibili a priori<br>Nel caso in cui i firewall non siano in grado (o siano impossibilitati a causa dell\u2019uso di SIP\/TLS) di aprire le porte richieste dinamicamente \u00e8 possibile configurare l\u2019apertura delle porte staticamente. In questo caso in genere \u00e8 bene ridurre il range di porte RTP negoziate.<br><\/p>\n\n\n\n<p>Se \u00e8 abilitato il protocollo RTCP ogni conversazione ha bisogno di 2 porte RTP, quindi limitare eccessivamente il range di porte RTP pu\u00f2 inficiare il numero di chiamate contemporaneamente gestibili.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NAT E VOIP: SIP, SDP E RTP &#8211; PROBLEMI SIP utilizza molto spesso gli indirizzi IP nei propri headers, un esempio significativo \u00e8 il metodo REGISTER. La richiesta di registrazione viene effettuata da un telefono per rendersi raggiungibile dal SIP proxy, a tale scopo viene utilizzato l\u2019header Contact il quale viene compilato con IP e [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":833,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[7],"tags":[],"class_list":{"0":"post-483","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-voip"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>NAT E VOIP: Una convivenza difficile - parte 9 - Blog Beevoip<\/title>\n<meta name=\"description\" content=\"La richiesta di registrazione viene effettuata da un telefono per rendersi raggiungibile dal SIP proxy, a tale scopo viene utilizzato l\u2019header Contact\" \/>\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\/nat-e-voip-sip-una-convivenza-difficile-parte-09\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NAT E VOIP: Una convivenza difficile - parte 9 - Blog Beevoip\" \/>\n<meta property=\"og:description\" content=\"La richiesta di registrazione viene effettuata da un telefono per rendersi raggiungibile dal SIP proxy, a tale scopo viene utilizzato l\u2019header Contact\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.beevoip.it\/blog\/nat-e-voip-sip-una-convivenza-difficile-parte-09\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog Beevoip\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/beevoip\/\" \/>\n<meta property=\"article:published_time\" content=\"2022-04-14T06:56:44+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-04-14T06:59:06+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.beevoip.it\/blog\/wp-content\/uploads\/2022\/04\/Nat-e-voip9.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"720\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Asterweb\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Scritto da\" \/>\n\t<meta name=\"twitter:data1\" content=\"Asterweb\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.beevoip.it\\\/blog\\\/nat-e-voip-sip-una-convivenza-difficile-parte-09\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.beevoip.it\\\/blog\\\/nat-e-voip-sip-una-convivenza-difficile-parte-09\\\/\"},\"author\":{\"name\":\"Asterweb\",\"@id\":\"https:\\\/\\\/www.beevoip.it\\\/blog\\\/#\\\/schema\\\/person\\\/872a314e510b029d629c5a1463b72c9f\"},\"headline\":\"NAT E VOIP: Una convivenza difficile &#8211; 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