eturned -1: Bad file descriptorJul 28 20:44:33 WARNING[1133742896]: chan_sip.c:590 __sip_xmit: sip_xmit of 0x8108804 (len 387) to 147.135.8.129 returned -1: Bad file descriptorJul 28 20:44:34 WARNING[1133742896]: chan_sip.c:590 __sip_xmit: sip_xmit of 0x8108804 (len 387) to 147.135.8.129 returned -1: Bad file descriptorJul 28 20:44:35 WARNING[1133742896]: chan_sip.c:590 __sip_xmit: sip_xmit of 0x8108804 (len 387) to 147.135.8.129 returned -1: Bad file descriptorJul 28 20:44:36 WARNING[1133742896]: chan_sip.c:673 retrans_pkt: Maximum retries exceeded on call 6b8b4567327b23c6643c986966334873@0.0.0.0 for seqno 102 (Critical Request)