[asterisk-users] How to set externip in sip.conf automatically?

[Greg Delgado]

The easiest way is to register for free dynamic DNS
service at www.dyndns.com. Then use externhost=
instead of externip=  in sip.conf . If you are using a
Linksys router like the WRT54G, it already has a
dyndns client which will update the dyndns servers
with your ip address everytime it changes.

Greg 

--- Larry Alkoff <labradley at mindspring.com> wrote:

> As stated in the original post, when I entter the IP
> with an editor 
> directly into sip.conf calls work just fine but I am
> looking for a way 
> to have that done _automatically_.
> 
> The Asterisk - Future of Telephony book says it is
> possible for Asterisk 
> to access a Linux environment variable containing
> the IP information in 
> the form of "${ENV{variable}}.
> 
> It doesn't seem to work.  I am asking how to make it
> work.
> 
> Larry
> 
> Watkins, Bradley wrote:
> > If you already have the IP in a file, why don't
> you set it up so the
> > file itself says:  externip=xx.xx.xx.xx and then
> do a #include in
> > sip.conf for the /etc/myip file?  I believe you'll
> have to do a sip
> > reload either way (which can obviously be part of
> your cron job) if
> > you're not already, but that should do what you're
> looking to do.
> > 
> > - Brad 
> > 
> > -----Original Message-----
> > From: asterisk-users-bounces at lists.digium.com
> > [mailto:asterisk-users-bounces at lists.digium.com]
> On Behalf Of Larry
> > Alkoff
> > Sent: Tuesday, August 22, 2006 9:34 PM
> > To: Asterisk-users; Austin-asterisk-users
> > Subject: [asterisk-users] How to set externip in
> sip.conf automatically?
> > 
> >   I need to give Asterisk access to my external IP
> address to prevent
> > the NAT problem where caller cannot hear the
> callee's voice.
> > 
> > According to Asterisk - The Future of Telephony
> page 92 Environment
> > Variables:
> > 
> >    "Environment variables are a way of accessing
> Unix environment
> > variables from within Asterisk.  They are
> referenced in the form of
> >    ${ENV{var}}
> > where var is the Unix environment variable you
> wish to reference."
> > 
> > My external IP is placed each night in a file call
> /etc/myip and placed
> > in the $MYIP variable by /etc/bashrc when an shell
> is loaded.
> > 
> > So I have /etc/myip refreshed each night in a cron
> job and when a shell
> > is opened /etc/bashrc does:
> > export MYIP=`cat /etc/myip`
> > 
> > To access the variable in sip.conf I have tried:
> > 
> >      externip=${ENV(EXTERNIP)}
> > and
> >      ${ENV($EXTERNIP)}
> > but neither seems to work.
> > Is this the correct syntax?  Did I misinterpret
> the book?
> > 
> > I say neither seems to work because When I hard
> code
> > externip=69.91.84.176
> > there are no NAT problems but when I try to access
> the $MYIP variable
> > either of the ways above NAT prevents me hearing
> the callee's voice.
> > 
> > I have tried but not found a way to directly
> access the contents of MYIP
> > to the console using the CLI.  Is there a way to
> see or set _any_ Linux
> > enviromnent variable using the CLI?  More
> generally, how do I access the
> > Linux shell from the CLI?
> > 
> > The problem with simply using
> > externip=69.91.94.176
> > is that number is subject to change and I don't
> know an easy way to
> > automatically write the value into sip.conf
> programatically.
> > 
> > I could have just said "how do I do this" but
> wanted to show that I've
> > done my homework.
> > Thanks for any help.
> > 
> > Larry
> > 
> > --
> > Larry Alkoff N2LA - Austin TX
> > Using Thunderbird on Linux
> > _______________________________________________
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> 
> -- 
> Larry Alkoff N2LA - Austin TX
> Using Thunderbird on Linux
> _______________________________________________
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