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	<title>Marco&#039;s Informatik Blog &#187; iax.conf</title>
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		<title>No toni? No party!</title>
		<link>http://www.ciacci.biz/2006/12/12/no-toni-no-party/</link>
		<comments>http://www.ciacci.biz/2006/12/12/no-toni-no-party/#comments</comments>
		<pubDate>Tue, 12 Dec 2006 22:14:43 +0000</pubDate>
		<dc:creator>marco</dc:creator>
				<category><![CDATA[Asterisk]]></category>
		<category><![CDATA[iax.conf]]></category>
		<category><![CDATA[Personale]]></category>
		<category><![CDATA[sip.conf]]></category>
		<category><![CDATA[Telefonia]]></category>

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		<description><![CDATA[I toni dtmf sono molto importanti nella telefonia, sia classica che ip, basti pensare che sono indispensabili per i menù dei vari IVR (che personalemente odio  )
Nella stragrande maggioranza dei telefoni IP, per impostazione predefinita abbiamo toni dtmf in-band (oppure in-audio), ma questa modalità può dar problemi con la voicemail.
Inoltre questa modalità funziona se [...]]]></description>
			<content:encoded><![CDATA[<p>I toni dtmf sono molto importanti nella telefonia, sia classica che ip, basti pensare che sono indispensabili per i menù dei vari IVR (che personalemente odio <img src='http://www.ciacci.biz/wp-includes/images/smilies/icon_razz.gif' alt=':-P' class='wp-smiley' /> )<br />
Nella stragrande maggioranza dei telefoni IP, per impostazione predefinita abbiamo toni dtmf <strong>in-band (oppure in-audio)</strong>, ma questa modalità può dar problemi con la voicemail.<br />
Inoltre questa modalità funziona se c&#8217;è abilitato il codec <strong>ulaw (o alaw)</strong>, altrimenti la compressione potrebbe &#8220;danneggiare&#8221; il tono distorcendolo.<br />
Per funzionare con le voicemail i toni dovranno essere <strong>rfc2833 o SIP info</strong>.<br />
Altresì potete impostare <strong>auto</strong>, così facendo Asterisk se un dispositivo non sarà in grado di gestire un tono rfc2833, sarà usato inband.<br />
Dimenticavo, <strong>dtmfmode= auto, rfc2833 o inband </strong>in sip.conf o iax.conf o in ogni singola estensione.</p>
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		<title>2,3,4&#8230;more Asterisk!</title>
		<link>http://www.ciacci.biz/2006/12/05/234more-asterisk/</link>
		<comments>http://www.ciacci.biz/2006/12/05/234more-asterisk/#comments</comments>
		<pubDate>Tue, 05 Dec 2006 21:53:17 +0000</pubDate>
		<dc:creator>marco</dc:creator>
				<category><![CDATA[Asterisk]]></category>
		<category><![CDATA[iax.conf]]></category>
		<category><![CDATA[Internet]]></category>
		<category><![CDATA[sip.conf]]></category>

		<guid isPermaLink="false">http://www.ciacci.biz/2006/12/05/234more-asterisk/</guid>
		<description><![CDATA[Continuiamo la carrellata di post dedicati al collegamento di più Asterisk.
Adesso mettiamola sul difficile! Colleghiamo quattro server! 
Dobbiamo decidere se optare per una configurazione peer to peer (dove tutti i server hanno le &#8220;rotte&#8221; per gli altri) oppure un server &#8220;centrale&#8221; che conterrà le rotte per tutti gli altri, ed ogni server avrà una riga [...]]]></description>
			<content:encoded><![CDATA[<p>Continuiamo la carrellata di post dedicati al collegamento di più Asterisk.<br />
Adesso mettiamola sul difficile! Colleghiamo quattro server! <img src='http://www.ciacci.biz/wp-includes/images/smilies/icon_biggrin.gif' alt=':-D' class='wp-smiley' /><br />
Dobbiamo decidere se optare per una configurazione peer to peer (dove tutti i server hanno le &#8220;rotte&#8221; per gli altri) oppure un server &#8220;centrale&#8221; che conterrà le rotte per tutti gli altri, ed ogni server avrà una riga nel dialplan per indirizzare le chiamate per gli altri verso questo &#8220;hub&#8221;.<br />
Analiziamo brevemente vantaggi e svantaggi delle due soluzioni</p>
<blockquote>
<p>Vantaggi P2P</p>
<p>Se un centralino cade, tutti gli altri sono raggiungibili senza problemi, indipendentemente dal nodo offline.<br />
Le chiamate inoltre sono &#8220;spalmate&#8221; tra i vari PBX, con minore uso di risorse.<br />
Svantaggi P2P</p>
<p>Ogni centralino deve avere una &#8220;tabella di routing&#8221; che va costantemente aggiornata (su tutti i pbx, ogni volta viene aggiunto un nuovo nodo).<br />
E&#8217; anche vero che questi eventi sarebbero rari e non dipenderebbero dall&#8217;aggiunta di interni, ma solo di nuove rotte. (un conto è avere 8-10 server, un conto 100).<br />
Vantaggi &#8220;HUB&#8221;</p>
<p>Un unico &#8220;master&#8221; che contiene le rotte di tutti i centralini, quindi una sola tabella da aggiornare.<br />
Controllo centralizzato delle chiamate, rotte, monitoraggio e così via.<br />
Svantaggi &#8220;HUB&#8221;</p>
<p>Tutto il traffico tra i nodi passa da questa macchina, gli svantaggi sono ovviamente maggior carico sul server, e se muore questo sono drammi!</p></blockquote>
<p>Cenni su iax.conf e extensions.conf<br />
In ognuno dei due casi sarà opportuno mettere come context predefinito in sip.conf e iax.conf qualcosa del tipo from-internet, per intercettare le telefonate provenienti da centralini &#8220;esteri&#8221;.<br />
&#8220;p2p&#8221;<br />
in iax.conf saranno presenti tanti utenti quanti sono i centralini -1, quindi qualcosa nella forma (dove con il contesto locali si intende qualcosa che fa parte della stessa &#8220;rete&#8221;, potrebbe essere usato anche rete-asterisk&#8221;)</p>
<blockquote>
<p>ESEMPIO PBX-A<br />
[pbx-b]<br />
type=user<br />
host=IP_DI_B<br />
context=locali<br />
secret=*********<br />
trunk=yes<br />
[pbx-c]<br />
type=user<br />
host=IP_DI_C<br />
context=locali<br />
secret=*********<br />
trunk=yes<br />
&#8230;<br />
&#8230;</p></blockquote>
<p>inoltre saranno necessari i vari peer per comunicare con gli altri PBX (per non dover scrivere utente e password nel dialplan)</p>
<blockquote>
<p>[trunk_to_b]<br />
type=peer<br />
host=IP_DI_B<br />
username=pbx-a<br />
secret=*********<br />
context=locali<br />
[trunk_to_c]<br />
type=peer<br />
host=IP_DI_C<br />
username=pbx-a<br />
secret=**********<br />
context=locali<br />
&#8230;&#8230;<br />
&#8230;&#8230;</p></blockquote>
<p>Useremo invece che la classica dial, switch, che permette di effetuare il &#8220;forwarding&#8221; delle telefonate verso un altro pbx<br />
Es. numerazione PBX-B 31XXX, PBX-C 32XXX, PBX-D 33XXX</p>
<blockquote>
<p>exten=>_31XXX,1,Goto(switch_to_b,${EXTEN},1)<br />
exten=>_32XXX,1,Goto(switch_to_c,${EXTEN},1)<br />
exten=>_33XXX,1,Goto(switch_to_d,${EXTEN},1)<br />
[switch_to_b]<br />
switch => IAX2/trunk_to_b/locali<br />
[switch_to_c]<br />
switch => IAX2/trunk_to_c/locali<br />
[switch_to_d]<br />
switch => IAX2/trunk_to_d/locali</p></blockquote>
<p>Come risulta ovvio nel caso del p2p, tutti avranno le regole per raggiungere gli altri, mentre nel caso dell&#8217;uso dell&#8217;hub, lui avrà le regole per raggiunegre tutti gli altri, mentre tutti i PBX normali avranno una cosa del tipo</p>
<blockquote>
<p>exten=>_3XXXX,1,Goto(switch_to_hub,${EXTEN},1)<br />
[switch_to_hub]<br />
switch => IAX2/trunk_to_hub/chose_way<br />
Quindi nell&#8217;HUB</p>
<p>[chose_way]<br />
exten=>_30XXX,1,Goto(switch_to_a,${EXTEN},1)<br />
exten=>_31XXX,1,Goto(switch_to_b,${EXTEN},1)<br />
exten=>_32XXX,1,Goto(switch_to_c,${EXTEN},1)<br />
exten=>_33XXX,1,Goto(switch_to_d,${EXTEN},1)</p></blockquote>
<p>Ovviamente poi ogni centralino avrà un pattern per matchare le estensioni dei propri utenti locali, che possono avere anche più dispositivi.</p>
<blockquote>
<p>[locali]<br />
&#8230;&#8230;.<br />
&#8230;&#8230;.<br />
&#8230;&#8230;.<br />
exten=>30123,1,Dial(SIP/xlite&#038;SIP/GXP2000,30,r)<br />
exten=>30999,1,Dial(SIP/pippo,30,r)</p></blockquote>
<p>Ogni utente sarà appunto un type=user ed ogni dispositivo un type=friend</p>
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		<title>Asterisk power!</title>
		<link>http://www.ciacci.biz/2006/11/30/asterisk-power/</link>
		<comments>http://www.ciacci.biz/2006/11/30/asterisk-power/#comments</comments>
		<pubDate>Thu, 30 Nov 2006 22:01:56 +0000</pubDate>
		<dc:creator>marco</dc:creator>
				<category><![CDATA[Asterisk]]></category>
		<category><![CDATA[Enum]]></category>
		<category><![CDATA[Telefonia]]></category>
		<category><![CDATA[iax.conf]]></category>
		<category><![CDATA[Internet]]></category>
		<category><![CDATA[sip.conf]]></category>
		<category><![CDATA[VoIP]]></category>

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		<description><![CDATA[Non sapevo come intitolare questo post, sono andato sulla banalità! 
Per un progetto che stiamo portando avanti con un&#8217;Università, sto facendo varie prove, tra cui &#8220;interconessione&#8221; tra 2 PBX, utilizzo pratico di ENUM, fallback delle linee e tante amenità simili.
Alla base della mia demo ci sono 2 server Asterisk, uno di front-end puramente IP, un [...]]]></description>
			<content:encoded><![CDATA[<p>Non sapevo come intitolare questo post, sono andato sulla banalità! <img src='http://www.ciacci.biz/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' /><br />
Per un progetto che stiamo portando avanti con un&#8217;Università, sto facendo varie prove, tra cui &#8220;interconessione&#8221; tra 2 PBX, utilizzo pratico di ENUM, fallback delle linee e tante amenità simili.<br />
Alla base della mia demo ci sono 2 server Asterisk, uno di front-end puramente IP, un altro di back-end con una scheda Zaptel a cui è collegato un gateway gsm.<br />
Il sistema riceve telefonate sia SIP che IAX, telefonando direttamente via questi indirizzi al PBX, oppure facendo risolvere questi servizi da ENUM (vedi qualche mio post precedente).<br />
Innanzittutto il context di default in sip.conf e iax.conf sarà <strong>from-internet</strong>, intercettando così tutto il traffico che proviene &#8220;dall&#8217;esterno&#8221;.<br />
In <strong>extensions.conf </strong>avremo:</p>
<blockquote><p>[from-internet]<br />
exten=>390577xxxxxx,1,Dial(SIP/xlite,30)<br />
exten=>390577xxxxxx,2,GotoIf(($[${DIALSTATUS}=CHANNELUNAVAIL]?3:4)<br />
exten=>390577xxxxxx,3,Goto(switch_to_backend,MIOCELLULARE,1)<br />
exten=>390577xxxxxx,4,Goto(102)<br />
exten=>390577xxxxxx,102,Hangup</p></blockquote>
<p>Nella prima linea abbiamo che tutte le telefonate a quel numero telefonico saranno indirizzate verso l&#8217;estenzione xlite, il mio softphone.<br />
Se questo non è collegato, la variabile <strong>DIALSTATUS</strong> assumerà valore <strong>CHANNELUNAVAIL </strong>e la chiamata (alla linea 3) sarà switchata verso il server di back-end.<br />
La funzione <strong>switch</strong> permette di effettuare il forwarding delle chiamate verso un altro server , loggandosi con un utente di quel server e &#8220;dirottando&#8221; la chiamata in un contesto del dialplan del server remoto.<br />
In generale <strong>switch </strong>ha questa sintassi</p>
<blockquote><p>switch => IAX2/user:[key]@server/context</p></blockquote>
<p>Quindi nell&#8217;<strong>extensions.conf</strong> del server di front-end avremo:</p>
<blockquote><p>[switch_to_backend]<br />
switch => IAX2/user:password@ip_server_backend/from-internal</p></blockquote>
<p>Nel contesto <strong>from-internal</strong> del server di back-end ovviamente c&#8217;è un pattern che &#8220;intercetta&#8221; le chiamate verso i cellulari, quindi la chiamata sarà dirottata verso i gateway GSM (sono due porte FXO, gruppo 3, a ricerca ciclica)</p>
<blockquote><p>exten=>_3XXX.,1,Dial(ZAP/r3/${EXTEN})</p></blockquote>
<p>Complesso? <img src='http://www.ciacci.biz/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' /><br />
Non troppo!!In vostro soccorso può giungere il grandissimo <a href="http://voip-info.org" target="_blank">voip-info.org</a>, sia per <a href="http://www.voip-info.org/wiki/index.php?page=Asterisk+config+extensions.conf" target="_blank">extensions.conf</a> che per la connessione <a href="http://www.voip-info.org/wiki/view/Asterisk+-+dual+servers" target="_blank">tra due server Asterisk</a> (e mi ci metto <a href="http://www.ciacci.biz/2006/11/23/asterisk-2-asterisk" target="_blank">anche io</a>)</p>
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		<title>Asterisk 2 Asterisk</title>
		<link>http://www.ciacci.biz/2006/11/23/asterisk-2-asterisk/</link>
		<comments>http://www.ciacci.biz/2006/11/23/asterisk-2-asterisk/#comments</comments>
		<pubDate>Thu, 23 Nov 2006 20:48:46 +0000</pubDate>
		<dc:creator>marco</dc:creator>
				<category><![CDATA[Asterisk]]></category>
		<category><![CDATA[iax.conf]]></category>

		<guid isPermaLink="false">http://www.ciacci.biz/2006/11/23/asterisk-2-asterisk/</guid>
		<description><![CDATA[Ovvero collegare due (o più centralini) Asterisk tra di loro, ad esempio collegare 2 sedi distaccate della stessa azienda, o più semplicemente parlare &#8220;a gratis&#8221; tra amici!
Sfrutteremo il protocollo nativo IAX per la comunicazione tra centralini, non è obbligatorio, ma dato che è sicuramente più semplice da usare di SIP e H.323 per questo scopo, [...]]]></description>
			<content:encoded><![CDATA[<p>Ovvero collegare due (o più centralini) Asterisk tra di loro, ad esempio collegare 2 sedi distaccate della stessa azienda, o più semplicemente parlare &#8220;a gratis&#8221; tra amici!<br />
Sfrutteremo il protocollo nativo IAX per la comunicazione tra centralini, non è obbligatorio, ma dato che è sicuramente più semplice da usare di SIP e H.323 per questo scopo, inoltre non risente troppo della presenza di eventuali NAT.<br />
La prima cosa da fare è configurare 2 utenti, uno per centralino, <strong>per poter ricevere</strong> le comunicazioni dall&#8217;altro, e due altri &#8220;utenti&#8221; <strong>per poter effettuare</strong> le chiamate.<br />
Una breve puntualizzazione sui <strong>type</strong> di Asterisk:</p>
<blockquote><p>user (può ricevere)<br />
peer (può chiamare)<br />
friend (può chiamare e ricevere)</p></blockquote>
<p>Chiameremo (con molta fantasia) <strong>PBXA e PBXB.</strong><br />
In iax.conf di A avremo </p>
<blockquote><p>[to_B]<br />
type=peer<br />
host=IP B<br />
username=utente_a<br />
secret=miapasswd<br />
context=locali</p>
<p>[utente_b]<br />
type=user<br />
host=IP B<br />
context=locali<br />
secret=miapasswd<br />
trunk=yes</p></blockquote>
<p>Ed in extensions.conf avremo: </p>
<blockquote><p>[outbound_to_B]<br />
exten=>_NUMERAZIONE-PER-B,1,Dial(IAX2/to_B/${EXTEN})</p></blockquote>
<p>Per il PBXB avremo una configurazione speculare.<br />
Buona conversazione!! </p>
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