NAT H.323 0.7 (beta) for Linux kernel 2.6.16 released

Change log:

1. Added new parameter 'default_rrq_ttl'. This is used to prevent Q.931 expectation expire too early when there is no
timeToLive in RRQ and RCF.

2. Made get_h245_addr static (suggested by Adrian Bunk)

3. Changed to use EXPORT_SYMBOL_GPL (suggested by Adrian Bunk)