[Asterisk-Users] Asterisk, IAX and NAT issue

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----- Original Message -----
From: "Dan" <dtoma at fx.ro>
To: <Asterisk-Users at lists.digium.com>
Sent: Thursday, June 26, 2003 7:38 AM
Subject: [Asterisk-Users] Asterisk, IAX and NAT issue


> Hi,
>
> I have two Asterisks identically installed on two computers.
> One of them is directly connected to the Internet, the other one through a
> NAT router (Netgear MR314).
> On the one behind the router I have an X100P card installed for PSTN
> connections.
> In the local LAN of each PBX they are several hardware IP phones (Cisco
7960
> and 7940 with SIP images, firmware image P0S3-04-4-00.bin).
>
> I have defined the following extension in the one behind the NAT:
>
> exten => _3XX,1,Dial(IAX/apbx at x.y.z.u/${EXTEN})
> exten => _3XX,2,Hangup
> exten => _3XX,102,Hangup
>
> where x.y.z.u is the IP address of the PBX directly connected to the
> internet.
> apbx is the IAX user defined on that PBX in iax.conf file like that:
>
> [apbx]
> type=user
> username=apbx
> auth=plaintext
> permit=n.n.n.n/255.255.255.0        ; n.n.n.n external NAT router address
> host=dynamic
> context=fullaccess
> ;allow=all
>
> In this way, I can call any 3XX extension using an IAX connection between
> the two PBX's.
> It works perfect.
>
> Now, on the other PBX I have the following in extensions.conf
>
> exten => _1XX,1,Dial(IAX/pspbx at n.n.n.n/${EXTEN})
> exten => _1XX,2,Hangup
> exten => _1XX,102,Hangup
>
> where n.n.n.n is the external IP address of the NAT router.
> pspbx is the IAX user defined on the PBX behind the router, in iax.conf
file
> like that:
>
> [pspbx]
> type=user
> username=pspbx
> auth=plaintext
> permit=0.0.0.0/0.0.0.0
> host=dynamic
> context=fullaccess
> ;allow=all
>
> When I try to call extension 103, I get on the local PBX console (the one
> connected directly to the internet):
>
>     -- Executing Dial("SIP/351-d7ca", "IAX/pspbx at n.n.n.n/103") in new
stack
>     -- Calling using options
>
'exten=103;callerid="MyOffice"<351>;language=en;username=pspbx;formats=2;cap
> ability=65283;version=1;adsicpe=2'
>     -- Called pspbx at n.n.n.n/103
>   == No one is available to answer at this time
>     -- Hungup 'IAX[n.n.n.n:5036]/46'
>     -- Executing Hangup("SIP/351-d7ca", "") in new stack
>   == Spawn extension (fullaccess, 103, 2) exited non-zero on
'SIP/351-d7ca'
>
> and a busy tone.
> Nothing one the console of the other PBX.
>
> The PBX behind the NAT is in DMZ (so completely exposed to the internet).
> Making a VPN connection between the two PBX (using PPTP) it works in both
> direction, so this is only a NAT related issue.
>
> I have missed something in configuring the system?
>
>
> Thanks and best regards,
> Dan
>
>
>
>
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