asterisk users - Sep 2010 - Confused about notifyringing in sip.conf

Hello list,

I read this in sip.conf :

notifyringing = no             ; Control whether subscriptions already 
INUSE get sent RINGING when another call is sent (default: yes)

What does this mean ?!

Does this mean that when I mark this as "yes", a phone that already
has
taken a call will be send a second and third call ?!

I want that if a phone is in use (calling), the phone does not ring on a 
second call.


Is it possible that by setting this as "no", my phone's BLF-lamps
are
not blinking when a phone is ringing ?!



Kind regards,

Jonas.
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Hi!
> notifyringing = no ; Control whether subscriptions already 
> INUSE get sent RINGING when another call is sent (default: yes)
> 
> Does this mean that when I mark this as "yes", a phone that
already has
> taken a call will be send a second and third call ?!
No, not directly: This setting is only about SIP subscription information 
spread via NOTIFY messages, and thus only concerns the hint (BLF) feature 
of Asterisk.
> I want that if a phone is in use (calling), the phone does not ring on a
> second call.
The term you are looking for is "call waiting"; use GROUP() or 
call-limit= to control the number of calls for a specific phone (or 
employ DEVICE_STATE()).

Philipp