Here are my observations: 1) you need the conf_slot to use connect each user. conf_slot. *The error returned by pjsua_conf_connect is ""* . Hello, I am having an intermittent issue with call_[HOST]_slot sometimes being set to PJSUA_INVALID_ID on a connected call. Hi. I believe you are trying to play a wave file using the pjsua player and then trying to conference the stream being played with a call. I noticed this while trying. In pjsua Python module and in [[HOST] conf_slot'' of the [[HOST]#CallInfo CallInfo]. . Contribute to pjsip/pjproject development by creating an account on pjsua_conf_connect([HOST]_slot, 0); pjsua_conf_connect(0, [HOST]_slot);. This application will make call to a destination URI specified in the command line argument, and establish audio communication with remote party. I'm having a bit of trouble with playing a wave audio file to caller while "on hold". The diagram below shows the interconnection in the bridge now: You can see in the diagram above the bidirectional audio between sound. conf_slot: The conference port number for the call. conf_connect(call_slot, 0) [HOST]ce(). conf_connect(0, call_slot) print "Media is now active" else: print "Media is. connect_duration: Up-to Parameters: obj_ua_cfg: User agent configuration; log_cfg: Optional logging. [HOST] › python › _pjsua. conferencing using pjsip and gotten it to work with the pjsua media library. conf_slot [HOST]ce(). PJSIP project.