[Asterisk-Users] SIP, NAT & Asterisk

[John Todd]

>Hi all,
>--------
>beacause I am a newbie in the asterisk ralm and the existing documentation
>could not satisfy I'd like to ask you some Questions:
>
>1. Does somewhere in the Internet exist additional documentations for asterisk
>configuration ?

http://www.digium.com/handbook-draft.pdf

In addition, there are a variety of home-built pages.
http://www.automated.it/guidetoasterisk.htm
http://asterisk.gnuinter.net/


>2. Does Asterisk work as a standard SIP Proxy ?

No.  Asterisk can perform basic SIP redirection, but it is not a 
standard SIP proxy in many of the ways that you might expect.  It can 
do _some_ of the features of a SIP proxy, but to call it a SIP proxy 
would be an overstatement.

>3. I am just installing a Asterisk PBX in our institute and additionally I
>purchased some ot the Snom 100  SIP devices. For SIP account I have
>registered with iptel.org and fwd.pulver.com. Both work fine with the Snom
>100 device. I tried the Snom 100 from home via a Linksys DSL router wich
>supports UPnp and port range forwarding to the private network. I faced some
>troubles with registering the Snom with IPTEL.ORG from my NAT'ed network.
>Because I'd like to setup a Asterisk PBX to my private Network as well my
>approach is to connect the SNOM to the asterisk at home network and establish
>a server-server connection via IAX to the institutes Asterisk server. The
>institute's Asterisk can login at iptel.org and fwd.pulver.com. If soembody
>wants to call me he should first try to reach me at my Snom phone at
>institutes premisses and after a defined time this call should be forwarded
>to my home asterisk server to reach the SNom 100 at home.  BTW - for calling
>out I want to use the AVM Fritz ISDN card with ISDN4LINUX. I could not find
>any doc for Asterisk- ISDN4LINUX configuration.  Later I'd like to upgrade to
>a Digium device to support conferencing. Wich of the Digium's devices you
>propose for a normal EuroISDN line (2 B-channels) ? I have attached a small
>figure for my SIP configuration aaproach.
>

My suggestion is that if your Asterisk server is behind a NAT, the 
only hosts it should talk with are devices that are also behind the 
NAT, or other Asterisk servers via IAX or IAX2 which may be on the 
outside of the NAT.  Anything else causes more headaches than it's 
worth.  I'm afraid I have no experience with the EuroISDN equipment, 
so I am not qualified to answer that part of your questions.

JT

>
>Thank you for your help
>
>regards
>
>Olaf
>
>
>--
>Dipl. Ing. Olaf Menzel - System Engineer
>FOKUS - Fraunhofer Institute for Open Communication Systems:
>- Competence Center for Advanced Satellite Communication
>Schloss Birlinghoven, 53754 Sankt Augustin, Germany
>Phone: +49-2241-14-3494   Mobile: +49-175-2616161    Fax: +49-2241-14-43494
>email: olaf.menzel at fokus.fhg.de       Internet: http://www.fokus.fhg.de/satcom
>Attachment converted: PrivateSpace:asterisk-conf.gif (GIFf/prvw) (000324C8)