PhoneBOX 3.3.0.508

FIX - Various SIP server reliability issues:

• Prevent two clients answering or unparking a call at exactly the same time and causing a call to drop
• Increase number of available RTP ports
• Better support for early media
• Proper support for PRACK and UPDATE methods
• Better clean-up for completed SIP transactions
• Change SIP invitation sequence for outbound calls
• Ensure non-AS device hangups also hang up the SIP provider leg of the call
• Only start ringing tone when media is not early
• Avoid RTP overlaps during unpark situations (hold music RTP vs. regular RTP)
• Various crash prevention fixes
• Drop any call on non-AS devices when registration expires
• Various issues with the SIP softphone devices
• Amend default available SIP softphones to 20
• Better logging