On-hook agents feature

114. Added on-hook agent phone feature. This feature allows inbound calls from
customers to ring on an on-hook agent phone, but not be transferred to 
that agent until the agent's phone is answered. If the call times out 
then the call will go on to the next agent. This is defined in the 
Phones record and allows the agent using the vicidial.php agent screen 
to not have to stay on the phone at all times when they are logged in. 
You will need to add the following lines to the default context in your 
extensions.conf file:
; these are used for the ring_all function in VICIDIAL
exten => _8331*.,1,Playback(sip-silence)
exten => _8331*.,n,AGI(agi-VDAD_RINGALL.agi,${EXTEN})
exten => _8331*.,n,AGI(agi-VDAD_RINGALL.agi,${EXTEN})
exten => _8331*.,n,Hangup

115. Added ring_all Next Agent Call option for in-groups. This works with on-
hook agent phones to allow all available agents to have their phones
ring at the same time, with the first agent to pick up their phone 
receiving the call. It is not recommended to use this on high-volume 
systems or systems with many agents available.

On-hook agents feature