asterisk-13.23.1-imap from amd64/packages have a bug with 'res_rtp_asterisk.so' module loading. res_rtp_asterisk.so is present in /usr/local/lib/asterisk/modules.
User authentication is completely broken because of that. ... Loading res_ael_share.so. [Nov 13 19:03:26] WARNING[-1]: loader.c:1182 load_resource: Module 'res_rtp_asterisk.so' could not be loaded. [Nov 13 19:03:26] WARNING[-1]: loader.c:1182 load_resource: Module 'res_rtp_asterisk.so' could not be loaded. [Nov 13 19:03:26] WARNING[-1]: loader.c:1182 load_resource: Module 'res_rtp_asterisk.so' could not be loaded. [Nov 13 19:03:26] WARNING[-1]: loader.c:1182 load_resource: Module 'res_rtp_asterisk.so' could not be loaded. [Nov 13 19:03:26] WARNING[-1]: loader.c:583 load_dlopen: Error loading module 'res_rtp_asterisk.so': Cannot load specified object [Nov 13 19:03:26] WARNING[-1]: loader.c:1182 load_resource: Module 'res_rtp_asterisk.so' could not be loaded. Loading res_config_pgsql.so. ... [Nov 13 19:13:31] ERROR[-1][C-00000000]: rtp_engine.c:435 ast_rtp_instance_new: No RTP engine was found. Do you have one loaded? [Nov 13 19:13:31] NOTICE[-1][C-00000000]: chan_sip.c:26363 handle_request_invite: Failed to authenticate device "gogo" <sip:876@10.0.0.1>