Networks that use SIP to start and stop sessions between their users
will frequently be upgraded with software and hardware changes.
Users will similarly frequently change their client software and the
way they use the network. In order to allow troubleshooting and
regression testing, it is useful to provide debugging as part of the
network fabric. This draft describes an event package that provides
debugging configuration to SIP entities and a SIP private header that
triggers logging of SIP signalling and identifies logs at mulitiple
SIP entities as belonging to a single end-to-end session.
A list of related IETF drafts and non-IETF specifications is included
to help develop this topic.