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	<title>Marco&#039;s Informatik Blog &#187; sip.conf</title>
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		<title>Asterisk + SIP + VPN</title>
		<link>http://www.ciacci.biz/2007/08/20/asterisk-sip-vpn/</link>
		<comments>http://www.ciacci.biz/2007/08/20/asterisk-sip-vpn/#comments</comments>
		<pubDate>Mon, 20 Aug 2007 19:25:22 +0000</pubDate>
		<dc:creator>marco</dc:creator>
				<category><![CDATA[Asterisk]]></category>
		<category><![CDATA[sip.conf]]></category>
		<category><![CDATA[Vista]]></category>

		<guid isPermaLink="false">http://www.ciacci.biz/2007/08/20/asterisk-sip-vpn/</guid>
		<description><![CDATA[Ho provato sulla mia pelle un piccolo problema con Asterisk associato ad una vpn, ma mi spiego meglio.
In questa installazione ho un asterisk collegato a vari telefoni presenti in 4 sedi, collegate con varie VPN IPSEC, e delle volte le telefonate avevano audio unidirezionale; questo nella stragrande maggioranza dei casi è dovuto a problemi di [...]]]></description>
			<content:encoded><![CDATA[<p>Ho provato sulla mia pelle un piccolo problema con Asterisk associato ad una vpn, ma mi spiego meglio.<br />
In questa installazione ho un asterisk collegato a vari telefoni presenti in 4 sedi, collegate con varie VPN IPSEC, e delle volte le telefonate avevano audio unidirezionale; questo nella stragrande maggioranza dei casi è dovuto a problemi di NAT.<br />
Bene si direte voi, ma una VPN non è NAT&#8230;.bhe questo è vero, ma ad Asterisk chi glielo dice che per quelle reti non deve provare il natting? (quindi avendo per questi device <strong>nat=never o nat=no </strong>non si ha audio)<br />
Glielo diciamo noi attraverso il parametro <strong>localnet </strong>nella sezione [general] di sip.conf, ad esempio così</p>
<blockquote><p>localnet=192.168.0.0/255.255.255.0<br />
localnet=192.168.1.0/255.255.255.0<br />
localnet=192.168.2.0/255.255.255.0<br />
localnet=192.168.3.0/255.255.255.0</p></blockquote>
<p>Lo stesso effetto si ottiene mettendo nelle varie configurazioni specifiche dei  friends la dicitura nat=yes, ma non è corretto dal punto di vista tecnico, dato che si tratta di altre reti facenti parte della struttura di Asterisk, non un device dietro NAT.</p>
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		<title>Patton 4638 a monte di un PBX (update)</title>
		<link>http://www.ciacci.biz/2007/07/30/patton-4638-a-monte-di-un-pbx-update/</link>
		<comments>http://www.ciacci.biz/2007/07/30/patton-4638-a-monte-di-un-pbx-update/#comments</comments>
		<pubDate>Mon, 30 Jul 2007 17:39:26 +0000</pubDate>
		<dc:creator>marco</dc:creator>
				<category><![CDATA[Asterisk]]></category>
		<category><![CDATA[Inalp - Patton]]></category>
		<category><![CDATA[Trixbox]]></category>
		<category><![CDATA[patton]]></category>
		<category><![CDATA[sip.conf]]></category>
		<category><![CDATA[VoIP]]></category>

		<guid isPermaLink="false">http://www.ciacci.biz/2007/07/30/patton-4638-a-monte-di-un-pbx-update/</guid>
		<description><![CDATA[Piccolo aggiornamento sul post precedente, ho dovuto fare una piccola correzione alla configurazione postata in precedenza, in quanto non era necessario dtmf-dialing, ed il sintomo che dava era curioso, ovvero il numero di telefono digitato da alcuni apparecchi collegati al PBX classico, erano &#8220;storpiati&#8221;.
Ad esempio se io digitavo 0577123456 questo mi diventava 0505777711223345455656 ad esempio!!!
Togliendolo [...]]]></description>
			<content:encoded><![CDATA[<p>Piccolo aggiornamento sul post precedente, ho dovuto fare una piccola correzione alla configurazione postata in precedenza, in quanto non era necessario <strong>dtmf-dialing</strong>, ed il sintomo che dava era curioso, ovvero il numero di telefono digitato da alcuni apparecchi collegati al PBX classico, erano &#8220;storpiati&#8221;.<br />
Ad esempio se io digitavo 0577123456 questo mi diventava 0505777711223345455656 ad esempio!!!<br />
Togliendolo tutto ok, inoltre ho creato un nuovo utente per usarlo come &#8220;friend&#8221; lato pbx ed inoltre ho aggiunto delle rotte per chiamare i cellulari, 8XX e 7XX</p>
<blockquote><p>#&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-#<br />
#                                                                #<br />
# SN4638/5BIS/UI                                                 #<br />
# R3.20 2006-11-17 H323 SIP BRI                                  #<br />
# 2007-07-27T06:39:21                                            #<br />
# Generated configuration file                                   #<br />
#                                                                #<br />
#&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-#</p>
<p>cli version 3.20<br />
dns-client server 88.149.128.12<br />
webserver port 80 language en<br />
snmp community public ro</p>
<p>system</p>
<p>ic voice 0</p>
<p>profile ppp default</p>
<p>profile call-progress-tone IT_Dialtone<br />
play 1 200 425 -12<br />
pause 2 200<br />
play 3 600 425 -12<br />
pause 4 1000</p>
<p>profile call-progress-tone IT_Alertingtone<br />
play 1 1000 425 -12<br />
pause 2 4000</p>
<p>profile call-progress-tone IT_Busytone<br />
play 1 500 425 -12<br />
pause 2 500</p>
<p>profile tone-set default</p>
<p>profile tone-set IT<br />
map call-progress-tone dial-tone IT_Dialtone<br />
map call-progress-tone ringback-tone IT_Alertingtone<br />
map call-progress-tone busy-tone IT_Busytone<br />
map call-progress-tone release-tone IT_Busytone<br />
map call-progress-tone congestion-tone IT_Busytone</p>
<p>profile voip default<br />
codec 1 g711alaw64k rx-length 20 tx-length 20<br />
codec 2 g711ulaw64k rx-length 20 tx-length 20</p>
<p>profile voip ASTERISK<br />
codec 1 g729 rx-length 20 tx-length 20<br />
codec 2 g711ulaw64k rx-length 20 tx-length 20<br />
codec 3 g711alaw64k rx-length 20 tx-length 20</p>
<p>profile pstn default</p>
<p>profile sip default</p>
<p>profile sip asterisk</p>
<p>profile aaa default<br />
method 1 local<br />
method 2 none</p>
<p>context ip router</p>
<p>interface IF_IP_WAN<br />
ipaddress 192.168.1.101 255.255.255.0<br />
no napt-inside</p>
<p>interface IF_IP_LAN<br />
ipaddress 192.168.1.1 255.255.255.0<br />
no napt-inside</p>
<p>context cs switch<br />
digit-collection timeout 4<br />
national-prefix 0<br />
international-prefix 00</p>
<p>routing-table called-e164 RT_2_ISDN<br />
route .%T dest-service HUNTING MT_ITC</p>
<p>routing-table called-e164 RT_ISDN_2_SIP<br />
route 99[1-9].T3 dest-interface IF_S0_PSTN<br />
route 1[1-9].T3 dest-service SER_HUNT_OUT<br />
route 0[1-9].T3 dest-service SER_HUNT_OUT<br />
route 00[1-9].T3 dest-service SER_HUNT_OUT<br />
route 8[0-9].T3 dest-service SER_HUNT_OUT<br />
route 7[0-9].T3 dest-service SER_HUNT_OUT<br />
route 3[0-9].T3 dest-service SER_HUNT_OUT<br />
route default dest-service SER_HUNT_OUT</p>
<p>mapping-table itc to itc MT_ITC<br />
map default to speech</p>
<p>interface isdn IF_S0_PSTN<br />
route call dest-interface IF_S0_PHONE<br />
dtmf-dialing</p>
<p>interface isdn IF_S0_PHONE1<br />
route call dest-table RT_ISDN_2_SIP<br />
use profile tone-set IT</p>
<p>interface isdn IF_S0_PHONE2<br />
route call dest-table RT_ISDN_2_SIP<br />
use profile tone-set IT</p>
<p>interface isdn IF_S0_PHONE3<br />
route call dest-table RT_ISDN_2_SIP<br />
use profile tone-set IT</p>
<p>interface isdn IF_S0_PHONE4<br />
route call dest-table RT_ISDN_2_SIP<br />
use profile tone-set IT</p>
<p>interface sip IF_SIP_ASTERISK<br />
bind gateway GW-ASTERISK<br />
service default<br />
route call dest-table RT_2_ISDN<br />
early-disconnect<br />
remote-party-id called-party<br />
remote-party-id calling-party<br />
address-translation outgoing-call from-header user-part fix 210 host-part call<br />
use profile voip ASTERISK</p>
<p>service hunt-group SER_HUNT_OUT<br />
timeout 6<br />
drop-cause normal-unspecified<br />
drop-cause no-circuit-channel-available<br />
drop-cause network-out-of-order<br />
drop-cause temporary-failure<br />
drop-cause switching-equipment-congestion<br />
drop-cause access-info-discarded<br />
drop-cause circuit-channel-not-available<br />
drop-cause resources-unavailable<br />
route call 1 dest-interface IF_SIP_ASTERISK<br />
route call 2 dest-interface IF_S0_PSTN</p>
<p>service hunt-group HUNTING<br />
drop-cause normal-unspecified<br />
drop-cause no-circuit-channel-available<br />
drop-cause network-out-of-order<br />
drop-cause temporary-failure<br />
drop-cause switching-equipment-congestion<br />
drop-cause access-info-discarded<br />
drop-cause circuit-channel-not-available<br />
drop-cause resources-unavailable<br />
drop-cause user-busy<br />
route call 1 dest-interface IF_S0_PHONE1<br />
route call 2 dest-interface IF_S0_PHONE2<br />
route call 3 dest-interface IF_S0_PHONE3<br />
route call 4 dest-interface IF_S0_PHONE4</p>
<p>context cs switch<br />
no shutdown</p>
<p>gateway sip GW-ASTERISK<br />
bind interface IF_IP_WAN router</p>
<p>service default<br />
domain 192.168.1.00<br />
realm 192.168.1.100<br />
authentication 210 password 210<br />
default-server 192.168.1.100 loose-router<br />
registrar 192.168.1.100 5060<br />
user 210<br />
session-timer 1800</p>
<p>gateway sip GW-ASTERISK<br />
no shutdown</p>
<p>port ethernet 0 0<br />
medium auto<br />
encapsulation ip<br />
bind interface IF_IP_WAN router<br />
no shutdown</p>
<p>port ethernet 0 1<br />
medium auto<br />
encapsulation ip<br />
bind interface IF_IP_LAN router<br />
no shutdown</p>
<p>port bri 0 0<br />
clock auto<br />
encapsulation q921<br />
power-feed</p>
<p>q921<br />
protocol pp<br />
uni-side auto<br />
encapsulation q931</p>
<p>q931<br />
protocol dss1<br />
uni-side net<br />
encapsulation cc-isdn<br />
bind interface IF_S0_PHONE1 switch</p>
<p>port bri 0 0<br />
no shutdown</p>
<p>port bri 0 1<br />
clock auto<br />
encapsulation q921<br />
power-feed</p>
<p>q921<br />
protocol pp<br />
uni-side auto<br />
encapsulation q931</p>
<p>q931<br />
protocol dss1<br />
uni-side net<br />
encapsulation cc-isdn<br />
bind interface IF_S0_PHONE2 switch</p>
<p>port bri 0 1<br />
no shutdown</p>
<p>port bri 0 2<br />
clock auto<br />
encapsulation q921<br />
power-feed</p>
<p>q921<br />
protocol pp<br />
uni-side auto<br />
encapsulation q931</p>
<p>q931<br />
protocol dss1<br />
uni-side net<br />
encapsulation cc-isdn<br />
bind interface IF_S0_PHONE3 switch</p>
<p>port bri 0 2<br />
no shutdown</p>
<p>port bri 0 3<br />
clock auto<br />
encapsulation q921<br />
power-feed</p>
<p>q921<br />
protocol pp<br />
uni-side auto<br />
encapsulation q931</p>
<p>q931<br />
protocol dss1<br />
uni-side net<br />
encapsulation cc-isdn<br />
bind interface IF_S0_PHONE4 switch</p>
<p>port bri 0 3<br />
no shutdown</p>
<p>port bri 0 4<br />
clock auto<br />
encapsulation q921</p>
<p>q921<br />
protocol pmp<br />
uni-side auto<br />
encapsulation q931</p>
<p>q931<br />
protocol dss1<br />
uni-side user<br />
encapsulation cc-isdn<br />
bind interface IF_S0_PSTN switch</p>
<p>port bri 0 4<br />
no shutdown<br />
Lo username 210 in sip.conf</p>
<p>[210]<br />
username=210<br />
type=friend<br />
secret=210<br />
record_out=Adhoc<br />
record_in=Adhoc<br />
qualify=no<br />
port=5060<br />
nat=never<br />
mailbox=210@device<br />
host=dynamic<br />
dtmfmode=inband<br />
context=from-internal<br />
canreinvite=no<br />
disallow=all<br />
allow=alaw</p>
</blockquote>
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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>

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		<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>

		<guid isPermaLink="false">http://www.ciacci.biz/2006/11/30/asterisk-power/</guid>
		<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>Un utente, più telefoni</title>
		<link>http://www.ciacci.biz/2006/11/21/un-utente-piu-telefoni/</link>
		<comments>http://www.ciacci.biz/2006/11/21/un-utente-piu-telefoni/#comments</comments>
		<pubDate>Tue, 21 Nov 2006 22:16:40 +0000</pubDate>
		<dc:creator>marco</dc:creator>
				<category><![CDATA[Asterisk]]></category>
		<category><![CDATA[sip.conf]]></category>

		<guid isPermaLink="false">http://www.ciacci.biz/2006/11/21/un-utente-piu-telefoni/</guid>
		<description><![CDATA[Uno dei vantaggi dei sistemi IP-PBX Asterisk è quello di permettere ai propri utenti di avere più periferiche, sia telefoni IP che softphone, associati al proprio utente e di far squillare questi dispositivi nell&#8217;ordine che preferiamo.
Ad esempio possiamo avere un softphone nel portatile ed un telefono fisso sulla scrivania, così quando avremo acceso il notebook [...]]]></description>
			<content:encoded><![CDATA[<p>Uno dei vantaggi dei sistemi IP-PBX Asterisk è quello di permettere ai propri utenti di avere più periferiche, sia telefoni IP che softphone, associati al proprio utente e di far squillare questi dispositivi nell&#8217;ordine che preferiamo.<br />
Ad esempio possiamo avere un softphone nel portatile ed un telefono fisso sulla scrivania, così quando avremo acceso il notebook magari squillerà solo quello, facendo andare sul fisso le altre telefonate se siamo occupati. Mentre se scordiamo il portatile avremo sempre quello fisso per rispondere!! <img src='http://www.ciacci.biz/wp-includes/images/smilies/icon_smile.gif' alt=':-)' class='wp-smiley' /><br />
Il concetto di base è quello di creare il nostro utente in sip.conf</p>
<blockquote><p>[pippo]<br />
type=user<br />
secret=pluto<br />
context=from-internal</p></blockquote>
<p>e poi due periferiche sip </p>
<blockquote><p>[xlite]<br />
username=pippo<br />
type=friend<br />
qualify=no<br />
port=5060<br />
nat=never<br />
host=dynamic<br />
dtmfmode=rfc2833<br />
context=from-internal<br />
canreinvite=no<br />
callerid=&#8221;Marco&#8221; <1234></p>
<p>[gxp2000]<br />
username=pippo<br />
type=friend<br />
qualify=no<br />
port=5060<br />
nat=never<br />
host=dynamic<br />
dtmfmode=rfc2833<br />
context=from-internal<br />
canreinvite=no<br />
callerid=&#8221;Marco&#8221; <1234></p></blockquote>
<p>A questo punto la regola più semplice è quella per far squillare entrambi i telefoni contemporaneamente: </p>
<blockquote><p>exten=>1234,1,Dial(SIP/xlite&#038;SIP/gxp2000,30)</p></blockquote>
<p>Semplice no? <img src='http://www.ciacci.biz/wp-includes/images/smilies/icon_wink.gif' alt=';-)' class='wp-smiley' />  </p>
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