So this code acks the 401 Unauthorized message. It is possible
that this message is lost on the way we will not be able to
respond to the 401 again. The right thing would be to "fork" off
the transaction to deal with re-transmissions.
In preparation of introducing multiple identities we need to
remove usage of SIPUserAgent>>#username. The next step is to
actually be able to pass a different identity.
Add a testcase for testing ProxyAuthenticate and ProxyAuthorize,
extend the grammar and parser to handle the needed bits. Document
another error/failure with the dialog handling code and create a
testcase that fully connects a call.
Avoid infinite auth retries and remember if the last message has
been an authentication request. Ignore the 100 TRYING like messages
as they do not add much value.
Holger Hans Peter Freyther