Greetings, i've been posted a message to this list in july, which had one response. Thanks for that idea! Unfortunately asterisk is only a hobby, and did not have much time dealing with the problem since. My original letter was long, i wouldn't post it again, the archive url is http://archives.free.net.ph/message/20070710.053008.c02209c0.en.html Since than i've upgraded to 1.4.8 from 1.2 series, i thought this might help. It did not. Answering to the question asked from me in july, no, i'm not behind nat, and i did not have reinvite=yes in my configs. I've put it into the sip.conf, tried, but the call hung up again. I'd be greatful for more ideas of solving the problem. Fresh logs when hanging up, from asterisk console: -- SIP/neophonex99-out-08213ac8 is making progress passing it to SIP/neophonex57-out-081e8a78 [Aug 2 21:54:51] WARNING[24739]: chan_sip.c:11948 handle_response_invite: Re-invite to non-existing call leg on other UA. SIP dialog '29312b1d2fc464560ff9ef7747c614d2 at sip.neophonex.hu'. Giving up. -- SIP/neophonex99-out-08213ac8 answered SIP/neophonex57-out-081e8a78 -- Native bridging SIP/neophonex57-out-081e8a78 and SIP/neophonex99-out-08213ac8 [Aug 2 21:54:57] WARNING[24739]: chan_sip.c:11948 handle_response_invite: Re-invite to non-existing call leg on other UA. SIP dialog '6d52c03e65d0dfaa53434ea81b948df6 at sip.neophonex.hu'. Giving up. == Spawn extension (internal, 9520620*********, 3) exited non-zero on 'SIP/neophonex57-out-081e8a78' [Aug 2 21:54:57] NOTICE[24749]: pbx_spool.c:351 attempt_thread: Call completed to SIP/0630********@neophonex57-out Thanks for any help Adam