Fix buffer overrun that could have been exploited with a crafted skinny packet designed to exploit this mistake in bounds checking.

Expanding on 05263818 to support boolean tel url params in mod_sofia

BNPH-6470 follow up to commit 68d863a1 removing the original line that performed the curl request to avoid a double request in mod_xml_curl

This appears to have been accidentally added in commit
79ebcb10 which sought to provide a
mechanism for disabling Sofia's chat interface.  The abort(3) here
achieved that a bit too well.

add enable-chat sofia profile param which defaults to true when not present, set to false to turn off the chat interface in sofia

On start DTMF packets we were showing the last write timestamp as a
signed value when it's an unsigned value, which could result in it
appearing incongruous with later packets where the value was displayed
correctly.

I found a problem here but it may not completely match your expectations.
I reviewed the RFC 4028 and checked against the code and I discovered we should not be putting a Min-SE in any response at all besides a 422:

section 5:

   The Min-SE header field MUST NOT be used in responses except for
   those with a 422 response code.  It indicates the minimum value of
   the session interval that the server is willing to accept.

I corrected this problem and implemented the 422 response so if you request a value lower than the minimum specified for the profile.
If the value is equal or higher to the minimum, it will be reflected in the Session-Expires header in the response and no Min-SE will be present.

FS-5997 regression from commit 70accd9f this caused some attended transfers to calls with multiple targets to get the abondoned channels to be stuck on write lock

add generic keepalive system and implement it in sofia to send MESSAGE or INFO packets in-dialog at specified interval.

Adds app: enable_keepalive 0|<seconds>
This app can be run in the dialplan or with execute_on_* type variables for B-legs.

Adds sofia param: keepalive-method  : defaults to MESSAGE can also be "INFO"
This param sets which SIP method to use.

FS-6447 --resolve return subscriber-absent platform-code 20 if <dial> is attempted to user that is not registered

Upgrade to OpenSSL 1.0.1g in Windows build (Visual Studio 2010 and 2012)