asterisk users - Sep 2004 - Checking Return Codes

Hi,

I must be blind, how does one check then act upon the return code from 
the previous command?
For instance, "Answer" says it can return non zero.  How do I check
for
that.  It doesn't set any other variables like Dial does.

In this case, all I'm really trying to do is not answer if the line has 
already been picked up.  Do I have to make sure the channel is available 
before I issue the Answer cmd.

Thanks,
Glenn

On Tue, 2004-09-07 at 21:48, Glenn A. Thompson wrote:
> Hi,
> 
> I must be blind, how does one check then act upon the return code from 
> the previous command?
> For instance, "Answer" says it can return non zero.  How do I
check for
> that.  It doesn't set any other variables like Dial does.
Most commands return a 0 or non zero value, and jump to priority n+101
if the return value is non-zero.
> In this case, all I'm really trying to do is not answer if the line has
> already been picked up.  Do I have to make sure the channel is available 
> before I issue the Answer cmd.
> 
> Thanks,
> Glenn
> 
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