You need an enabled jitter buffer for FEC to work.
If a packet is missing we look in the jitter buffer for the next one,
if the next packet is present we pass it to the decoder to extract
the FEC info from it. If there's no FEC inside the packet, the Opus decoder
will return PLC.

Merge pull request #99 in FS/freeswitch from ~BRIAN/freeswitch-brian:bugfix/FS-6961-mod_erlang_event-add-call-uuid-to to master

* commit '89f3f5e2':
  FS-6961: [mod_erlang_event]: Add call UUID to call_hangup message

Merge pull request #262 in FS/freeswitch from feature/FS-7587-add-ipv6-support-to-verto-websockets to master

* commit '3b2d00f3':
  FS-7587 Add ipv6 support to Verto / Websockets

* commit '8f343939':
  Added new options to nibble bill for minimum charges and rounding #FS-7560

* commit '441dd912':
  FS-7204, Allow to force a per-account send-message-query-on-register

* commit 'f135232e':
  FS-7196: add recording_follow_transfer support for semi attended transfers

These options are:

1) nibble_rounding: The number of decimal places to round the cost of the call to
2) nibble_minimum: The minimum charge to apply to a call

Rounding is applied before the minimum charging, and these steps only occur at call end to make sure they're accurate.

Checks for minimum_charge before call starts

"Billing done" flag to the data struct, and used that to exit early in the event processing during hangup has already occured.

* commit 'a4ef9d6b':
  FS-7405: if all is required don't pass if total ne pass

Merge pull request #232 in FS/freeswitch from ~ITALOROSSI/freeswitch:bugfix/FS-7242-delayed-bye-after-REFER to master

* commit 'beeea017':
  FS-7242 Waiting for state CS_PARK when receiving REFER.

* commit 'b4250c87':
  Fix switch_ivr_parse_event() to not hangup a session when there is no media yet

* commit 'f5e0a879':
  JIRA FS-7412. Added new LDAP schema (fsaccount.schema) with relevant attributes to match FS directory params and variables. Changed mod_xml_ldap code to reflect new schema. Updated xml_ldap.conf.xml as well to reflect mapping of new attributes.

FS-7593 --resolve  add locking keyed on device name around any database updates adding/removing the device

Ephemeral ECDH (ECDHE) was supported already. This patch adds Ephemeral
DH (DHE). To enable it, add DH parameters into the private-key file of
your server (agent.pem). For example via:
openssl dhparam -out dh.pem 2048

FS-7561 #resolve

FS-7513 add video-auto-floor-msec param to control how long a member must have the audio floor before also taking the video floor %NEEDS_DOC

little more tolerant of big timing errors between the symbols at the far end,
and as they are received by us.

* commit 'b641ab6d': (629 commits)
  bump
  FS-7519: CID:1294454 fix leak
  CID:1301145,1301144: Bit shift bounds checking
  CID 1216601 Fix a possible memory leak in mod_basic
  FS-7519 mod_av cleanup and refactor to work on higher resolution
  FS-7513 refactor
  FS-7500 FS-7499 refactoring while battling chrome
  FS-7585: add rtmp video support
  FS-7585: spaces to tabs and clean up trilling spaces
  FS-7519: reverting part of f85a86e64d3ebcd34d63bc6239694e5a524760a1
  FS-7519: fix build issue with clang-3.5
  FS-7500: start media thread one answer/pre_answer
  FS-7519: fix typo
  FS-7499 FS-7500 mods for interop against latest chrome builds
  FS-7500 just send refresh and not full reset on uuid_video_refresh
  FS-7513 mods to bandwidth sizing and remove flush calls
  FS-7519: auto set some values on avformat recording
  FS-7519: [mod_av] fix modules.conf
  FS-7519: merge mod_avcodec and mod_avformat into mod_av
  FS-7553 reduce opencv library requirement to 2.4.5 to allow centos 7
  ...