Hi Matthew, Can you point me to some documentations to understand the libss7 source code and how it is linked with Asterisk? I have been struggling to modify your code to send ISUP_RELEASE on getting CPG with user busy from PSTN but has been successful yet. thanks, Rana _________________________________________________________________ Send e-mail anywhere. No map, no compass. http://windowslive.com/Explore/hotmail?ocid=TXT_TAGLM_WL_hotmail_acq_anywhere_122008 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.digium.com/pipermail/asterisk-ss7/attachments/20081217/3f7ca667/attachment.htm