vicidial not working ..executing session 8600051

Hi,
After i login into the /agc/vicidial.php.My softphone ringing and it play, you are currently only in this conference....that its.nothing happen. What should i do now.
Thank you
== Parsing '/etc/asterisk/manager.conf': Found
== Manager 'sendcron' logged on from 127.0.0.1
> Channel SIP/2003-08182a40 was answered.
-- Executing MeetMe("SIP/2003-08182a40", "8600051") in new stack
== Parsing '/etc/asterisk/meetme.conf': Found
-- Created MeetMe conference 1023 for conference '8600051'
-- Playing 'conf-onlyperson' (language 'en')
== Manager 'sendcron' logged off from 127.0.0.1
Nov 25 04:57:21 NOTICE[2332]: rtp.c:331 process_rfc3389: Comfort noise support incomplete in Asterisk (RFC 3389). Please turn off on client if possible. Client IP: 192.168.88.101
After i login into the /agc/vicidial.php.My softphone ringing and it play, you are currently only in this conference....that its.nothing happen. What should i do now.
Thank you
== Parsing '/etc/asterisk/manager.conf': Found
== Manager 'sendcron' logged on from 127.0.0.1
> Channel SIP/2003-08182a40 was answered.
-- Executing MeetMe("SIP/2003-08182a40", "8600051") in new stack
== Parsing '/etc/asterisk/meetme.conf': Found
-- Created MeetMe conference 1023 for conference '8600051'
-- Playing 'conf-onlyperson' (language 'en')
== Manager 'sendcron' logged off from 127.0.0.1
Nov 25 04:57:21 NOTICE[2332]: rtp.c:331 process_rfc3389: Comfort noise support incomplete in Asterisk (RFC 3389). Please turn off on client if possible. Client IP: 192.168.88.101