There are cases when calls coming to a subscriber of C5 CE,
is being challenged by this subscriber, the use case for that could be
if for e.g. we have a PBX/SBC connected to NGCP via subscriber's object.
Current implementation of SEMS works so, that in case parameters;
'enable_auth' and 'enable_aleg_auth' are set to value 'yes',
SEMS tries to pass the digest for the calling party.
This leads to the empty 'username' and wrong 'response' parameters of
the Proxy-Authorization header, eventually the Authorization process is failed.
This is to be changed, so in case 'u=', 'p=' and 'd=' have not been
previously sent by the Proxy (in 'P-App-Param:'), or rather they are empty, authentication should be transparent,
hence be processed by the calling side, with no interfer from SEMS into that.
(real ticket number: TT#128701)
Change-Id: I989dbe3ed9d5a1d2ec73cb0ad081254c9b9eca32
Donat Zenichev
10f7927093