Seven, Thanks. So far, sangoma passthought the SS7 by extracting and copying the properity to freetdm channel info. It utilizes some structure siConEvnt(IAM,ANM) and siCnStEvnt(ACM...). Here now one INVITE comes into FS, but the "application/isup" in the SIP message dispears in the FS outbound. I'll do more debug and google. Thank you so much. Windy ======== 2013-05-25 10:50:05 Original Message： ======== Bottom line is you should try, by looking the log and possibly using the "info" app you should can find out. I bet you should be receive the SIP-T anyway. I remembered some discussion about this, maybe you can google against this list and find out more. I think Sangoma has some private implementation which can help SS7 passthru over SIP. Or maybe try to put the SIP-T int the new b64 codec? -- Seven Du http://www.freeswitch.org.cn http://about.me/dujinfang http://www.dujinfang.com Sent with Sparrow On Saturday, May 25, 2013 at 10:22 AM, xiaofengcanyuexp@163.com wrote: Hi, support team I know FS can pass out SS7 info via properity header. While, how it handles an incoming SIP-T message with SS7 info encapsulated in "content-type". Will it parse it or discard it? Thanks Windy ------------------- 2013-05-25 _________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com FreeSWITCH-powered IP PBX: The CudaTel Communication Server http://www.cudatel.com Official FreeSWITCH Sites http://www.freeswitch.org http://wiki.freeswitch.org http://www.cluecon.com FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org = = = = = = = = = = = = = = = = = = = = = = Thanks Windy