Update to reflect changed semantics of is_address_ipv6.py
Add UT cases for combined originating and terminating AS invocation
Protect against mixing up calling and called numbers in SAS (fixes #399)
Enable access logging
Merge pull request #599 from Metaswitch/in_dialog_sas

[Reviewer: Alex] Protect against mixing up calling and called numbers in SAS (fixes #399)
Use 504 rc
Merge pull request #600 from Metaswitch/iss572

[Reviewer: Mike] Overload return codes
Update cpp-common
Merge pull request #601 from Metaswitch/iss572

[No reviewer] Update cpp-common
Update pjsip
Merge pull request #602 from Metaswitch/multipart_issues

[No reviewer] Update pjsip
Check rc of get_auth
Don't reject call with expired ODI token
Add orig parameter to AS route headers
Unit tests
Change AsChain references from UASTransaction
Merge branch 'old_issue564' into issue564
Updates after review
Merge pull request #604 from Metaswitch/iss603

[Reviewer: Rob] Check rc of get_auth
Refactor MMTEL call service invocation to avoid AsChainLink reallocation issues