Feat/reply with all via headers in sip responses #157
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Some softswitches rely on Via header information in the 100 Trying response to be able to route calls internally (Sippy Softswitch for example). Without this information, softswitches sending calls to FreeSWITCH will fail to process the call because they are not able to match/route (internally) the INVITE with the 100 response received.
This behaviour may or may not be desirable and may or may not be SIP protocol complaint (it's internal spaghetti logic that could be avoided). However the end result is less interoperability in the wild.
The intent of this PR is to increase the interoperability of Sofia SIP/FreeSWITCH with a wider range of softswitches.