Features
- Add support for extraHeaders on Invitation.accept (#910)
- Make the interval at which re-REGISTER requests are sent configurable (UserAgentOptions.refreshFrequency) (#902)
- Add
onAck
delegation for Session (#911)
Fixes
- add gruu check to registerer to restore previous behavior
- publisher: add check so that it does not attempt to enter published state when already there
- fix a typo in extra headers for an uncommon failure case