Help me pls! experts there, can you pls help me here?

we are using vicidial. the problems are as follows:

After the login on vicidial, the ip phone/soft phone will ring then, if the call has been accepted, the line goes busy. Most of the times, after the login the ip phone/soft phone will not ring.

What may be the problem?

In the asterisk, this is the error.

-- Executing Conference("SIP/2036-8e3c", "8600057") in new stack

Sep 22 14:37:39 NOTICE[12166]: member.c:415 member_exec: [ $Revision: 1.9 $ ] be gin processing member thread, channel => SIP/2036-8e3c
Sep 22 14:37:39 NOTICE[12166]: member.c:742 create_member: attempting to parse p assed params, stringp => 8600057
Sep 22 14:37:39 NOTICE[12166]: member.c:793 create_member: parsed data params, i d => 8600057, flags => , priority => 0, vad_prob_start => 0.050000, vad_prob_con tinue => 0.020000
Sep 22 14:37:39 NOTICE[12166]: member.c:1077 create_member: created member, type => S, priority => 0, readformat => 4
Sep 22 14:37:39 NOTICE[12166]: member.c:451 member_exec: CHANNEL INFO, CHANNEL = > SIP/2036-8e3c, DNID => (null), CALLER_ID => (null), ANI => (null)
Sep 22 14:37:39 NOTICE[12166]: member.c:454 member_exec: CHANNEL CODECS, CHANNEL => SIP/2036-8e3c, NATIVE => 4, READ => 4, WRITE => 4
Sep 22 14:37:39 NOTICE[12166]: conference.c:504 start_conference: attempting to find requested conference
Sep 22 14:37:39 NOTICE[12166]: conference.c:563 find_conf: found conference in c onflist, name => 8600057
Sep 22 14:37:39 NOTICE[12166]: conference.c:796 add_member: member added to conf erence, name => 8600057
Sep 22 14:37:39 NOTICE[12166]: member.c:514 member_exec: begin member event loop , channel => SIP/2036-8e3c
Sep 22 14:37:39 NOTICE[12166]: member.c:532 member_exec: Conference Members: 2
Sep 22 14:37:39 NOTICE[12166]: member.c:538 member_exec: Quiet debug 0 - 0
Sep 22 14:37:39 NOTICE[12166]: member.c:688 basic_play_sound: playing conference message enter
Sep 22 14:37:39 NOTICE[12166]: member.c:688 basic_play_sound: playing conference message enter
Sep 22 14:37:39 NOTICE[12166]: member.c:351 process_outgoing: unanticipated deli very time, delivery_diff => -680110378, delivery.tv_usec => 542946
Sep 22 14:37:41 NOTICE[12166]: member.c:612 member_exec: unable to read from cha nnel, channel => SIP/2036-8e3c
Sep 22 14:37:41 NOTICE[12166]: member.c:635 member_exec: end member event loop, time_entered => 1158961059
== Spawn extension (default, 8600057, 1) exited non-zero on ‘SIP/2036-8e3c’
– Executing DeadAGI(“SIP/2036-8e3c”, “call_log.agi|h”) in new stack
– Launched AGI Script /var/lib/asterisk/agi-bin/call_log.agi
Sep 22 14:37:41 ERROR[12927]: conference.c:216 conference_exec: skipping leave m essage on SIP/2036-8e3c
Sep 22 14:37:41 NOTICE[12927]: member.c:688 basic_play_sound: playing conference message leave
Sep 22 14:37:41 NOTICE[12927]: conference.c:234 conference_exec: found member sl ated for removal, channel => SIP/2036-8e3c
Sep 22 14:37:41 NOTICE[12927]: conference.c:844 remove_member: member accounting , channel => SIP/2036-8e3c, te => 1158961059, fi => 103, fid => 2, fo => 99, fod => 0, tt => 2
Sep 22 14:37:41 NOTICE[12927]: member.c:1104 delete_member: freeing member flags , name => SIP/2036-8e3c
Sep 22 14:37:41 NOTICE[12927]: member.c:1116 delete_member: deleting member inpu t frames, name => SIP/2036-8e3c
Sep 22 14:37:41 NOTICE[12927]: member.c:1130 delete_member: deleting member outp ut frames, name => SIP/2036-8e3c
Sep 22 14:37:41 NOTICE[12927]: member.c:1156 delete_member: freeing member trans lator paths, name => SIP/2036-8e3c
Sep 22 14:37:41 NOTICE[12927]: member.c:1168 delete_member: freeing member chann el name, name => SIP/2036-8e3c
Sep 22 14:37:41 NOTICE[12927]: member.c:1175 delete_member: freeing member
Sep 22 14:37:41 NOTICE[12927]: conference.c:869 remove_member: removed member fr om conference, name => 8600057, remaining => 1

help me pls???