Fresh Elastix with timeous and Unreachable errors

We have a new small fresh and test Elastix box with a2billing working fine, secured and optimized, but we're facing some weird timeouts and unreachable errors with trunks and devices. Of course this is not a firewall issue coz already disabled and tested it all. We already contacted with provider DataCenter and SIP provider and all appears to be fine .at. network level. This are the errors details: [2014-02-22 16:26:55] NOTICE[20835] chan_sip.c: Peer '302' is now Reachable. (9ms / 2000ms) [2014-02-22 16:26:55] NOTICE[20835] chan_sip.c: Peer '202' is now Reachable. (159ms / 2000ms) [2014-02-22 16:46:03] WARNING[20835] chan_sip.c: Retransmission timeout reached on transmission fac352737a85353b35a807ea252fe62b for seqno 1 (Critical Response) -- See https://wiki.asterisk.org/wiki/display/AST/SIP+Retransmissions [2014-02-22 17:02:13] NOTICE[20835] chan_sip.c: Peer '202' is now UNREACHABLE! Last qualify: 159 [2014-02-22 17:02:15] NOTICE[20835] chan_sip.c: Peer '201' is now UNREACHABLE! Last qualify: 147 [2014-02-22 17:06:23] VERBOSE[20835] chan_sip.c: -- Registered SIP '201' at [login to view URL] [2014-02-22 17:06:23] NOTICE[20835] chan_sip.c: Peer '201' is now Reachable. (155ms / 2000ms) [2014-02-22 17:12:59] NOTICE[20835] chan_sip.c: Peer '54911234819 ' is now Lagged. (2075ms / 2000ms) [2014-02-22 17:12:59] NOTICE[20835] chan_sip.c: Peer '54911234782 ' is now Lagged. (2075ms / 2000ms) [2014-02-22 17:12:59] NOTICE[20835] chan_sip.c: Peer '17164061116 ' is now Lagged. (3136ms / 2000ms) [2014-02-22 17:12:59] NOTICE[20835] chan_sip.c: Peer '54932201923 ' is now Lagged. (3292ms / 2000ms) [2014-02-22 17:12:59] NOTICE[20835] chan_sip.c: Peer '54931845988 ' is now Lagged. (3291ms / 2000ms) [2014-02-22 17:12:59] NOTICE[20835] chan_sip.c: Peer '54932201917 ' is now Lagged. (3297ms / 2000ms) [2014-02-22 17:13:21] NOTICE[20835] chan_sip.c: Peer '54911234819 ' is now Reachable. (3ms / 2000ms) [2014-02-22 17:13:21] NOTICE[20835] chan_sip.c: Peer '54911234782 ' is now Reachable. (4ms / 2000ms) [2014-02-22 17:13:23] NOTICE[20835] chan_sip.c: Peer '17164061116 ' is now Reachable. (1161ms / 2000ms) [2014-02-22 17:13:23] NOTICE[20835] chan_sip.c: Peer '54932201917 ' is now Reachable. (1008ms / 2000ms) [2014-02-22 17:15:15] NOTICE[20835] chan_sip.c: Peer '303' is now UNREACHABLE! Last qualify: 234 [2014-02-22 17:15:26] NOTICE[20835] chan_sip.c: Peer '303' is now Reachable. (1102ms / 2000ms) [2014-02-22 17:16:25] NOTICE[20835] chan_sip.c: Peer '54911234819 ' is now UNREACHABLE! Last qualify: 401 [2014-02-22 17:16:25] NOTICE[20835] chan_sip.c: Peer '54911234782 ' is now UNREACHABLE! Last qualify: 400 [2014-02-22 17:16:29] NOTICE[20835] chan_sip.c: Peer '54932201904 ' is now UNREACHABLE! Last qualify: 1249 [2014-02-22 17:16:29] NOTICE[20835] chan_sip.c: Peer '54931845988 ' is now UNREACHABLE! Last qualify: 1250 [2014-02-22 17:16:29] NOTICE[20835] chan_sip.c: Peer '54932201917 ' is now UNREACHABLE! Last qualify: 1250 [2014-02-22 17:16:30] NOTICE[20835] chan_sip.c: Peer '303' is now UNREACHABLE! Last qualify: 1102 [2014-02-22 17:17:59] NOTICE[20835] chan_sip.c: -- Registration for '[login to view URL]' timed out, trying again (Attempt #2) [2014-02-22 17:17:59] NOTICE[20835] chan_sip.c: -- Registration for '[login to view URL]' timed out, trying again (Attempt #2) [2014-02-22 17:17:59] NOTICE[20835] chan_sip.c: -- Registration for '[login to view URL]' timed out, trying again (Attempt #2) [2014-02-22 17:18:00] NOTICE[20835] chan_sip.c: -- Registration for '[login to view URL]' timed out, trying again (Attempt #2) [2014-02-22 17:18:01] NOTICE[20835] chan_sip.c: -- Registration for '[login to view URL]' timed out, trying again (Attempt #2) [2014-02-22 17:18:06] NOTICE[20835] chan_sip.c: -- Registration for '[login to view URL]' timed out, trying again (Attempt #2)