[Mar 20 16:36:23] WARNING[6608]: channel.c:738 ast_channel_alloc: Channel allocation failed: Refusing due to active shutdown
[Mar 20 16:36:23] WARNING[6608]: chan_sip.c:3898 sip_new: Unable to allocate AST channel structure for SIP channel
[Mar 20 16:36:23] NOTICE[6608]: chan_sip.c:13851 handle_request_invite: Unable to create/find SIP channel for this INVITE