DIDs Fail..calls reaching box but are rejected

Hello Friends,

None of my DID are working any longer. Inbound route are pointed to one of my extensions. All worked previously but on a different distro.Everything else works just fine. I am clueless and have no idea where to start looking.
Any help from you gurus out there will be greatly appreciated

FREEPBX VERSION:2.10.0.4
ASTERISK VERSION:1.8.8.0 (SOURCE VERSION SAME)
OS:CENTOS 6.2 (FINAL)

LOGS
res_config_curl.c: [globals] not found in res_curl.conf
[2012-05-04 13:08:32] VERBOSE[1627] config.c: == Parsing ‘/etc/asterisk/sip_notify.conf’: [2012-05-04 13:08:32] VERBOSE[1627] config.c: == Found
[2012-05-04 13:08:32] VERBOSE[1627] config.c: == Parsing ‘/etc/asterisk/sip_notify_custom.conf’: [2012-05-04 13:08:32] VERBOSE[1627] config.c: == Found
[2012-05-04 13:08:32] VERBOSE[1627] config.c: == Parsing ‘/etc/asterisk/sip_notify_additional.conf’: [2012-05-04 13:08:32] VERBOSE[1627] config.c: == Found
[2012-05-04 13:08:33] VERBOSE[1627] chan_sip.c: – Got SIP response 503 “Service Unavailable” back from 2**.15.1**.1:7577
[2012-05-04 13:08:47] NOTICE[1627] chan_sip.c: Sending fake auth rejection for device “0774*****27” sip:0774*****[email protected]:5063;tag=as28a5b986