Hi all, I have the following net: sip-phone --> * --> sip-provider phone is x-lite on win and Asterisk is on Debian. The sip provider has portaSIP, essentially is a SER + BB2UA(vovida) + a billing system. The recording has succeeded, 'sip show peers' and 'sip show registry' are OK, while I have a problem on the INVITE: Oct 19 23:28:27 NOTICE[196620]: chan_sip.c:6712 handle_response: Failed to authenticate on INVITE to '"MyUsername" <sip:MyUsername@sip.providername.com>; tag=... Thanks in advance, Maurizio Simonetti