{"id":6860,"date":"2016-08-19T09:34:27","date_gmt":"2016-08-19T14:34:27","guid":{"rendered":"https:\/\/www.servimatango.com\/blog\/?p=6860"},"modified":"2019-06-11T07:36:30","modified_gmt":"2019-06-11T12:36:30","slug":"codificacion-de-la-voz","status":"publish","type":"post","link":"https:\/\/servervoip.com\/blog\/codificacion-de-la-voz\/","title":{"rendered":"Codificaci\u00f3n de la voz"},"content":{"rendered":"<p><strong>Codificaci\u00f3n de la voz : <\/strong> Ya tenemos claro que para transportar la voz se utilizan algunos protocolos como  SIP, IAX y otros como RTP o RTCP. Pero la voz es un a onda anal\u00f3gica que  necesita transformarse a digital en alg\u00fan formato antes de ser transmitida.  <\/p>\n<p>L\u00f3gicamente podr\u00edamos tratar de transmitirla tal cual resulta de la conversi\u00f3n  anal\u00f3gica y digital(ADC) pero resulta que nos encontramos en una red de paquetes  as\u00ed que debemos paquetizar esta informaci\u00f3n. Adem\u00e1s  si la transmitimos tal cual   resulta de la conversi\u00f3n ADC desperdiciar\u00edamos recursos de la red por lo que hace  falta encontrar un formato \u00f3ptimo.  Esa b\u00fasqueda de un formato \u00f3ptimo gener\u00f3 algunas alternativas de formatos  de transmisi\u00f3n llamadas codecs.   <\/p>\n<p><strong>Codecs  <\/strong><br \/>\nLa palabra codec proviene de abreviar las palabras  Codificaci\u00f3n y decodficaci\u00f3n.  Su funci\u00f3n principal es la de adaptar la informaci\u00f3n digital de la voz para obtener  alg\u00fan beneficio. Este beneficio en muchos casos es  la compresi\u00f3n de la voz de tal  manera que podamos utilizar menos ancho de banda del necesario.  Algunos codecs, soportados por Asterisk y com\u00fanmente usados en comunicaciones  deVoIP, son G.711, G.729, GSM, iLBC, entre otros.  Explicaremos brevemente tres de ellos.  <\/p>\n<p><strong>G.711  <\/strong><br \/>\nG.711 es uno de los codecs m\u00e1s usados de todos los  tiempos y proviene de un  est\u00e1ndar ITU8T que fue liberado en 1972. Viene en d os versiones u8law y a8law.  La primera versi\u00f3n se utiliza en los Estados Unidos  y la segunda se utiliza en  Europa.  Una de sus caracter\u00edsticas es la calidad de voz debido a que casi no la comprime.  Utiliza 64kbit\/s, es decir un muestreo de 8 bits a  8kHz. Es el c\u00f3dec recomendado  para redes LAN pero hay que pensarlo dos veces ante s de utilizarlo en enlaces  remotos debido al alto consumo de ancho de banda.  El soporte para este c\u00f3dec ya viene habilitado en E lastix.  <\/p>\n<p><strong>G.729  <\/strong><br \/>\nTambi\u00e9n se trata de una recomendaci\u00f3n ITU cuyas implementaciones ha sido  hist\u00f3ricamente licenciadas.  La ventaja en la utilizaci\u00f3n de G.729 radica principalmente en su alta compresi\u00f3n y  por ende bajo consumo de ancho de banda lo que lo ha ce atractivo para  comunicaciones por Internet. Pese a su alta compresi\u00f3n no deteriora la calidad de  voz significativamente y por esta raz\u00f3n ha sido ampliamente usado a trav\u00e9s de los  a\u00f1os por muchos fabricantes de productos de VoIP. <\/p>\n<p> G.729 utiliza 8kbit\/s por cada canal. Si comparamos este valor con el de  G.711notaremos que consume 8 veces menos ancho de b anda, lo cual a simple vista es un ahorro de recursos significativo. Existe n variaciones de G.729 que  utilizan 6.4kbit\/s y 11.8kbit\/s.  Para habilitar canales G.729 en Elastix hay que comprar una licencia por cada  canal.     <\/p>\n<p><strong>GSM  <\/strong><br \/>\nMuchas personas suelen preguntar si el codec GSM ti ene algo que ver con el  est\u00e1ndar de comunicaciones celulares y la respuesta  es que s\u00ed.  El est\u00e1ndar que define la tecnolog\u00eda celular GSM (Global Systemfor Mobile  communications) incluye este codec.  La ventaja de este c\u00f3dec tambi\u00e9n es su compresi\u00f3n.  Acerca de la calidad de voz.  GSM comprime aproximadamente a 13kbit\/s y ya viene  habilitado en Elastix  <\/p>\n<p>Tomado de:<br \/>\nArroba, M, &#038; Salazar, M. (2011). Propuesta de soluci\u00f3nes a las vulnerabilidades del protocolo de se\u00f1alizaci\u00f3n SIP en voz sobre IP: Red IP-PBX (tesis de pregrado). Escuela Superior Polit\u00e9cnica de Chimborazo, Riobamba, Ecuador.<\/p>\n<p>Fuente:<br \/>\nhttp:\/\/dspace.espoch.edu.ec\/bitstream\/123456789\/872\/1\/38T00263.pdf<\/p>\n<p>\n<div id=\"rev_slider_3_1_wrapper\" class=\"rev_slider_wrapper fullwidthbanner-container\" style=\"float:left;background-color:#E9E9E9;padding:0px;margin-left:0px;margin-right:0px;margin-top:0px;margin-bottom:0px;\">\n<!-- START REVOLUTION SLIDER 5.0.9 auto mode -->\n\t<div id=\"rev_slider_3_1\" class=\"rev_slider fullwidthabanner\" style=\"display:none;\" data-version=\"5.0.9\">\n<ul>\t<!-- SLIDE  -->\n\t<li data-index=\"rs-28\" data-transition=\"random\" data-slotamount=\"7\"  data-easein=\"default\" data-easeout=\"default\" data-masterspeed=\"300\"  data-thumb=\"\"  data-rotate=\"0\"  data-saveperformance=\"off\"  class=\"voipswitch videos subtitulos\" id=\"voipswitch videos subtitulos\" voipswitch videos subtitulos data-title=\"SubtitulosTexto\" data-description=\"\">\n\t\t<!-- MAIN IMAGE -->\n\t\t<img src=\"https:\/\/servervoip.com\/blog\/wp-content\/plugins\/revslider\/admin\/assets\/images\/dummy.png\"  alt=\"\"  width=\"879\" height=\"51\" data-lazyload=\"https:\/\/servervoip.com\/blog\/wp-content\/plugins\/revslider\/admin\/assets\/images\/transparent.png\" data-bgposition=\"center top\" data-bgfit=\"cover\" data-bgrepeat=\"no-repeat\" class=\"rev-slidebg\" data-no-retina>\n\t\t<!-- LAYERS -->\n\n\t\t<!-- LAYER NR. 1 -->\n\t\t<div class=\"tp-caption   tp-resizeme\" \n\t\t\t id=\"slide-28-layer-2\" \n\t\t\t data-x=\"\" \n\t\t\t data-y=\"1\" \n\t\t\t\t\t\tdata-width=\"['none','none','none','none']\"\n\t\t\tdata-height=\"['none','none','none','none']\"\n\t\t\tdata-transform_idle=\"o:1;\"\n \n\t\t\t data-transform_in=\"opacity:0;s:300;e:Power2.easeInOut;\" \n\t\t\t data-transform_out=\"opacity:0;s:300;s:300;\" \n\t\t\tdata-start=\"500\" \n\t\t\tdata-responsive_offset=\"on\" \n\n\t\t\t\n\t\t\tstyle=\"z-index: 5;\">\n\t\t\t\t<div class=\"rs-looped disabled\" ><img src=\"https:\/\/servervoip.com\/blog\/wp-content\/plugins\/revslider\/admin\/assets\/images\/dummy.png\" alt=\"\" data-ww=\"879\" data-hh=\"51\" data-lazyload=\"https:\/\/www.servervoip.com\/blog\/wp-content\/uploads\/2015\/10\/fondo-en-degradado-con-signod-copia.jpg\" data-no-retina> \n\t\t\t\t<\/div>\n\t\t<\/div>\n\n\t\t<!-- LAYER NR. 2 -->\n\t\t<div class=\"tp-caption mediumbgorange   tp-resizeme\" \n\t\t\t id=\"slide-28-layer-1\" \n\t\t\t data-x=\"6\" \n\t\t\t data-y=\"5\" \n\t\t\t\t\t\tdata-width=\"['653']\"\n\t\t\tdata-height=\"['41']\"\n\t\t\tdata-transform_idle=\"o:1;\"\n \n\t\t\t data-transform_in=\"opacity:0;s:300;e:Power3.easeInOut;\" \n\t\t\t data-transform_out=\"auto:auto;s:300;\" \n\t\t\tdata-start=\"500\" \n\t\t\tdata-splitin=\"none\" \n\t\t\tdata-splitout=\"none\" \n\t\t\tdata-responsive_offset=\"on\" \n\n\t\t\t\n\t\t\tstyle=\"z-index: 6; 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htmlDiv = document.getElementById('rs-plugin-settings-inline-css');\r\n\t\t\t\t\tif(htmlDiv) {\r\n\t\t\t\t\t\thtmlDiv.innerHTML = htmlDiv.innerHTML + htmlDivCss;\r\n\t\t\t\t\t}\r\n\t\t\t\t\telse{\r\n\t\t\t\t\t\tvar htmlDiv = document.createElement('div');\r\n\t\t\t\t\t\thtmlDiv.innerHTML = '<style>' + htmlDivCss + '<\/style>';\r\n\t\t\t\t\t\tdocument.getElementsByTagName('head')[0].appendChild(htmlDiv.childNodes[0]);\r\n\t\t\t\t\t}\r\n\t\t\t\t  <\/script>\r\n\t\t\t\t<\/div><!-- END REVOLUTION SLIDER --><br \/>\n&nbsp;<\/p>\n<hr \/>\n<h2>Contactos<\/h2>\n<p>Obt\u00e9n respuestas sobre tu Empresa Voip. Habla con un asesor especializado para despejar tus inquietudes.<\/p>\n<p><a href=\"http:\/\/www.servervoip.com\/voipswitch\/contacto-server-voip-switch\/\"><img loading=\"lazy\" src=\"https:\/\/www.servimatango.com\/blog\/wp-content\/uploads\/2015\/09\/contacto-servervoip.jpg\" alt=\"contacto servervoip\" width=\"690\" height=\"207\" class=\"aligncenter size-full wp-image-4446\" srcset=\"https:\/\/servervoip.com\/blog\/wp-content\/uploads\/2015\/09\/contacto-servervoip.jpg 690w, https:\/\/servervoip.com\/blog\/wp-content\/uploads\/2015\/09\/contacto-servervoip-300x90.jpg 300w\" sizes=\"(max-width: 690px) 100vw, 690px\" \/><\/a><br \/>\n[st_button button_text=\u00bb SOLICITA TU SERVER AHORA \u25ba\u00bb button_type_url=\u00bbhttp:\/\/www.servervoip.com\/voipswitch-comprar.php?server=50_promo\u00bb open_in=\u00bbnew_window\u00bb icon=\u00bbfa fa-shopping-cart\u00bb button_alignment=\u00bbcenter\u00bb button_margin_top=\u00bb-50&#8243; button_margin_bottom=\u00bb-20&#8243; button_size=\u00bbbtn-lg\u00bb button_color=\u00bbbtn-blue\u00bb appearing_animation=\u00bbfade_in\u00bb wrapper_padding_top=\u00bb0&#8243; wrapper_padding_left=\u00bb0&#8243; wrapper_padding_bottom=\u00bb0&#8243; wrapper_padding_right=\u00bb0&#8243; wrapper_bg_opacity_slider=\u00bb\u00bb id_wrapper=\u00bbelm_5c828b456ae9d\u00bb ][\/st_button]<br \/>\n&nbsp;<br \/>\n<strong>ServerVoIP<\/strong> te proporciona todas las herramientas necesarias para que crees y desarrolles <strong>tu negocio de comunicaci\u00f3n por internet.<\/strong><\/p>\n<p>Pertenece al Selecto Grupo de Emprendedores que decidieron cambiar su vida invirtiendo en un <strong>Server con ServerVoIP.<\/strong><\/p>\n<p><strong>ServerVoip <\/strong>presenta el mejor server fisico dedicado para telefonia voip que incluye el software de telefon\u00eda ip \u00abVoipSwitch\u00bb especial para voz sobre ip.<\/p>\n<p><strong>VoipSwitch <\/strong>es la plataforma ideal para que sin necesidad de conocimientos t\u00e9cnicos crees tu propia empresa de Telefon\u00eda IP VoIP y encuentres una forma de ganar DINERO en la red siendo carrier de telefon\u00eda sobre Ip (Voip). <\/p>\n<p>Te brindamos todas las herramientas para que est\u00e9s al nivel de las grandes empresas y negocios; puedas obsequiar llamadas gratis como estrategia de marketing en fidelizaci\u00f3n a tus clientes \/ free entre tus clientes; el servidor VoIP te permite utilizar m\u00faltiples proveedores como nosotros tenemos <a href=\"http:\/\/www.alosip.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">www.alosip.com.<\/a> (carrier \/ routes) para un mismo destino, vender terminaci\u00f3n (wholesale), clientes finales (retail), etc.<\/p>\n<p>El software te proporciona todo lo que necesitas; sistema llave en mano: para crear tu empresa de telefon\u00eda IP (VoIP) bajo tu propio nombre o marca. M\u00e1s informaci\u00f3n en <a href=\"http:\/\/marcaBlanca.servervoip.com\" target=\"_blank\" rel=\"noopener noreferrer\">marcaBlanca.servervoip.com<\/a><\/p>\n<p>Para que CREES y DESARROLLES tu propia empresa de telefonia por internet, revisa m\u00e1s detalles en <a href=\"http:\/\/www.servervoip.com\/voipswitch\/\">VoIPSwitch<\/a><\/p>\n<hr \/>\n<h1 style=\"text-align: center;\">\u00bfQuieres Emprender por Internet?<\/h1>\n<h3 style=\"text-align: center;\">\u00abAhora Trabajar desde la Comodidad de tu Casa y Ganar Dinero por Internet&#8230; Nunca Hab\u00eda Sido tan F\u00e1cil, R\u00e1pido y con RESULTADOS Impresionantes\u00bb<\/h3>\n<p style=\"text-align: center;\">Descubre el NEGOCIO Perfecto y convi\u00e9rtete en un EMPRESARIO de \u00c9xito creando y desarrollando tu Propia Empresa de Telefon\u00eda por Internet. <strong>Suscr\u00edbete y RECIBE FREE<\/strong>:<\/p>\n<h2 style=\"text-align: center;\">\u00a1Sie7e Poderosas Razones Que Tiene el EMPRENDEDOR Exitoso para Crear su Propia Empresa de Telefon\u00eda por Internet VoIP!&#8230;<\/h2>\n<p><img loading=\"lazy\" class=\"aligncenter wp-image-1229 size-medium\" src=\"http:\/\/servimatango.com\/negocios-rentables\/wp-content\/uploads\/2015\/07\/libro-server-voip-241x300.png\" alt=\"libro server voip\" width=\"241\" height=\"300\" \/><br \/>\n[st_accordion div_margin_bottom=\u00bb15&#8243; initial_open=\u00bb0&#8243; multi_open=\u00bbyes\u00bb wrapper_padding_top=\u00bb0&#8243; wrapper_padding_left=\u00bb0&#8243; wrapper_padding_bottom=\u00bb0&#8243; wrapper_padding_right=\u00bb0&#8243; wrapper_bg_opacity_slider=\u00bb\u00bb wrapper_bg_opacity=\u00bb50&#8243; wrapper_border_style=\u00bboutset\u00bb wrapper_rounded_topleft=\u00bb3&#8243; id_wrapper=\u00bbelm_5c828b0bd3fa6&#8243; ][st_item_accordion heading=\u00bb<img class=aligncenter src=http:\/\/servimatango.com\/negocios-rentables\/wp-content\/uploads\/2015\/07\/Boton-descarga-reporte.gif alt=Reporte width=500 height=145 \/>\u00bb id_wrapper=\u00bbelm_5c828b0bd3f58&#8243; ]<center><script type=\"text\/javascript\" src=\"http:\/\/app.getresponse.com\/view_webform.js?wid=10619501&#038;u=kSvx\"><\/script><\/center>[\/st_item_accordion][\/st_accordion]<\/p>\n<p><a href=\"https:\/\/www.servimatango.com\/blog\/sip-telefonia\/\">SIP Telefon\u00eda e IVR (Respuesta Autom\u00e1tica)<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Codificaci\u00f3n de la voz : Ya tenemos claro que para transportar la voz se utilizan algunos protocolos como SIP, IAX y otros como RTP o RTCP. Pero la voz es un a onda anal\u00f3gica que necesita transformarse a digital en alg\u00fan formato antes de ser transmitida. L\u00f3gicamente podr\u00edamos tratar de transmitirla tal cual resulta de&#8230;<\/p>\n<p><a class=\"excerpt-read-more btn btn-primary\" href=\"https:\/\/servervoip.com\/blog\/codificacion-de-la-voz\/\" title=\"ReadCodificaci\u00f3n de la voz\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":6861,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"image","meta":[],"categories":[13],"tags":[133,1861,1819,1179,404,28,18],"_links":{"self":[{"href":"https:\/\/servervoip.com\/blog\/wp-json\/wp\/v2\/posts\/6860"}],"collection":[{"href":"https:\/\/servervoip.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/servervoip.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/servervoip.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/servervoip.com\/blog\/wp-json\/wp\/v2\/comments?post=6860"}],"version-history":[{"count":0,"href":"https:\/\/servervoip.com\/blog\/wp-json\/wp\/v2\/posts\/6860\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/servervoip.com\/blog\/wp-json\/wp\/v2\/media\/6861"}],"wp:attachment":[{"href":"https:\/\/servervoip.com\/blog\/wp-json\/wp\/v2\/media?parent=6860"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/servervoip.com\/blog\/wp-json\/wp\/v2\/categories?post=6860"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/servervoip.com\/blog\/wp-json\/wp\/v2\/tags?post=6860"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}