Hi,I wanted to ask is it mandatory to send a response to a received request from within the invoked callback?e.g. in IM module when a IM is received the response is sent immediately from within the callback? what if the user wants to check a database or do some other processing before sending a response in some asynchronous way? regards arif -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20151005/8acddadf/attachment.html>