[Asterisk-Dev] why chan_sip:regcontext registers Noop ?

[Kevin P. Fleming]

Luigi Rizzo wrote:
> I notice that chan_sip.c has the option, when given a regcontext
> argument in sip.conf, to register an entry in the dialplan of the form
> 
> 	exten => 3456,1,Noop(3456)

Right, so in that context, you have also:

exten => _3XXX,2,Dial(SIP/${EXTEN})

Using 'regcontext' allows your dialplan to quickly know that a SIP peer 
is not available, rather than attempting a dial (which allows the 
dialplan to take alternative action if need be).