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

[Watkins, Bradley]

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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