resip/stack: handler for the dtmf-relay content type

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11063 ddefafc4-47db-0310-ae44-fa13212b10f2
travis: build recon in CI

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11064 ddefafc4-47db-0310-ae44-fa13212b10f2
travis: use libfreeradius-client-dev instead of radiusclient-ng

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11065 ddefafc4-47db-0310-ae44-fa13212b10f2
travis: add libsrtp-dev, required for recon build

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11066 ddefafc4-47db-0310-ae44-fa13212b10f2
travis: remove some build flags

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11067 ddefafc4-47db-0310-ae44-fa13212b10f2
reTurn/client: TurnSocket: fix for sending when not using TURN

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11068 ddefafc4-47db-0310-ae44-fa13212b10f2
resip/recon: ConversationManager: allow alternate sample rates to be selected

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11069 ddefafc4-47db-0310-ae44-fa13212b10f2
-added allowed events to 489 errors - thanks to Ionut Slaveanu for this fix

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11070 ddefafc4-47db-0310-ae44-fa13212b10f2
resip/recon: ConversationManager: specify UserProfile and extension headers when creating new remote participant

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11071 ddefafc4-47db-0310-ae44-fa13212b10f2
resip/recon: call acceptNIT()/rejectNIT() after handling INFO message

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11072 ddefafc4-47db-0310-ae44-fa13212b10f2
resip/dum: add some comments and a warning about acceptNIT and rejectNIT for SIP INFO

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11073 ddefafc4-47db-0310-ae44-fa13212b10f2
release: update for v1.9.3

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11074 ddefafc4-47db-0310-ae44-fa13212b10f2
release: update ChangeLog for v1.9.3

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11075 ddefafc4-47db-0310-ae44-fa13212b10f2