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

[Larry Alkoff]

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