[Asterisk-Users] detect SIP phone availability before dialing

[Mojo with Horan & Company, LLC]

This is a pretty popular question.  IIRC SIP phones can't tell you their 
statuses, you need to send a call to them and determine whether or not 
they're Busy Now...

bman at host.sk wrote:
> Hello,
> 
>  I need to detect availability of SIP phone before dialing. I need to
> know if phone is 
>  BUSY, CHANUNAVAIL before dialing. If phone is "free", then I will dial
> it.
> 
>  I need for automatic callback (.call files), but I need to know if it
> is available both
>  SIP phones before calling.
> 
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-- 
Mojo <mojo at horanappraisals.com>
Office Manger, Horan & Company, LLC
(907) 747-6666 x112