Update CEL sample config

git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@397514 f38db490-d61c-443f-a65b-d21fe96a405b
Fix crash when answering after a transport error occurs.

If a response to an initial incoming INVITE results in a transport error
the INVITE transaction is removed from the INVITE session. Any attempts
to answer the INVITE session after this results in a crash as it requires
the INVITE transaction to exist. This change explicitly locks the dialog
and checks to ensure that the INVITE transaction exists before answering.

(closes issue AST-1203)
Reported by: John Bigelow


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@397515 f38db490-d61c-443f-a65b-d21fe96a405b