Hi Attlila, I replied to you in the mailing list, but you may have overlooked it, I do hope that you will check the code in function isup_send_message(), it will fail to send SAM like messages! It's a potential bug if libss7 is one day active in sending SAM or similar messages. following is my previous reply to the mailing list, reproduced for your convenience: > which libss7 version are you looked into I am in fact looking in to your version checked out using the following: svn co https://observer.router.hu/repos_pub/libss7/trunk libss7 > I'm using mine and have tons > of incomming calls with SAM. I know that you have tons of INCOMMING calls with SAM but I am reporting a bug in sending SAMs NOT receiving SAMs :-) libss7 is currently not programmed to initiate OUTGOING calls with SAM, but I think the code should be correct any way. > regards, > Attila Thank you Attila! You're so kind to share your code and provide help! regards, Tian