[Asterisk-Users] Checking Return Codes

[Umar Sear]

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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