[reSIProcate] Issue with getRandomHex()

[Yannick Guay]

Hi,

I ran into an issue with DUM generating same transaction id several times
when my b2bua is handling multiple simultaneous calls.

I'm using DialogUsageManager::makeInviteSession() which generates a proper
branch parameter for the outgoing call but when it's time to send them down
to the stack the branch parameter is set again
by DialogUsageManager::send() (line 1036 or so), but same value gets reused
for all calls. As a result, only the first call gets out of my gateway, all
other subsequent calls are considered bad and eventually get dropped by
TransactionState.

Here is the line that I'm finding in log files.
2014-04-30T15:12:27.854-04:00 Warning - B2BUA TU sent us a duplicate
INVITE: fix this!

My knowledge of srandom and random is rather limited but I trust after
giving it a seed, then it should always hand off unique values?

Any Ideas what I'm doing wrong?

Best Regards,
-Yannick Guay
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