search for: __ast_channel_alloc_ap

Hi guys I have a site on Asterisk 1.8.11.0 running in Centos 6.5 that has about 150 concurrent callers. I keep getting these types of messages in the CLI: [May 21 11:39:21] WARNING[18469]: channel.c:1189 __ast_channel_alloc_ap: Channel allocation failed: Can't create alert pipe! Try increasing max file descriptors with ulimit -n [May 21 11:39:21] WARNING[18469]: chan_sip.c:7041 sip_new: Unable to allocate AST channel structure for SIP channel [May 21 11:39:21] WARNING[18469]: res_rtp_asterisk.c:459 create_new_socket:...

...# 3: [0x58efed] asterisk stasis_cache.c:903 caching_topic_exec() # 4: [0x586b90] asterisk stasis.c:1380 dispatch_message() # 5: [inlined] asterisk stasis.c:1490 publish_msg() # 6: [0x595786] asterisk stasis_channels.c:767 ast_channel_stage_snapshot_done() # 7: [0x49f122] asterisk channel.c:987 __ast_channel_alloc_ap() # 8: [0x49f409] asterisk channel.c:1009 __ast_channel_alloc() # 9: [0x4d270d] asterisk core_unreal.c:1222 ast_unreal_new_channels() #10: [0x4ce07e] asterisk core_local.c:1016 local_request_with_stream_topology() #11: [0x4a1fe7] asterisk channel.c:6353 request_channel() #12: [0x4a4c68] asteri...