Hello, Can anyone help me enumerate what locks are held (and the lock order) when each of the PJSUA callbacks is called? Is this documented anywhere? These ones: on_incoming_call on_call_state on_call_media_state seem to hold the PJSUA lock. I suspect they might also hold a dialog lock? I don't think on_dtmf_digit holds any locks. Thanks, -- Michael Broughton, Advanis Unintended Recipient & Unauthorized Use of E-Mail: This message and attachments may contain confidential or privileged information that is intended only for the named recipient of this e-mail. Any unauthorized use or distribution is not permitted. If you have received this e-mail in error, deleting the e-mail and notifying the sender would be appreciated. Thank you.