below is the output of asterisk cli..
== Manager 'sendcron' logged off from 127.0.0.1
-- Registered SIP 'cc100' at 122.169.88.243 port 24445 expires 3600
-- Saved useragent "eyeBeam release 1013t stamp 43069" for peer cc100
-- Unregistered SIP 'cc100'
-- Registered SIP 'cc100' at 122.169.88.243 port 24445 expires 3600
-- Saved useragent "eyeBeam release 1013t stamp 43069" for peer cc100
== Parsing '/etc/asterisk/manager.conf': Found
== Manager 'sendcron' logged on from 127.0.0.1
> Channel SIP/cc100-084a4d48 was answered.
-- Executing MeetMe("SIP/cc100-084a4d48", "8600052|F") in new stack
== Parsing '/etc/asterisk/meetme.conf': Found
-- Created MeetMe conference 1022 for conference '8600052'
-- Playing 'conf-onlyperson' (language 'en')
== Manager 'sendcron' logged off from 127.0.0.1
== Parsing '/etc/asterisk/manager.conf': Found
== Manager 'sendcron' logged on from 127.0.0.1
-- Executing AGI("Local/441517331419@default-fb93,2", "agi://127.0.0.1:4577/call_log") in new stack
-- AGI Script
agi://127.0.0.1:4577/call_log completed, returning 0
-- Executing Dial("Local/441517331419@default-fb93,2", "SIP/00441517331419@netindia|100|tTo") in new stack
-- Called 00441517331419@netindia
== Parsing '/etc/asterisk/manager.conf': Found
== Manager 'sendcron' logged on from 127.0.0.1
-- Executing AGI("Local/441517340757@default-4350,2", "agi://127.0.0.1:4577/call_log") in new stack
-- AGI Script
agi://127.0.0.1:4577/call_log completed, returning 0
-- Executing Dial("Local/441517340757@default-4350,2", "SIP/00441517340757@netindia|100|tTo") in new stack
-- Called 00441517340757@netindia
-- SIP/netindia-084acea8 is making progress passing it to Local/441517331419@default-fb93,2
-- SIP/netindia-0851c7c8 is circuit-busy
== Everyone is busy/congested at this time (1:0/1/0)
-- Executing Hangup("Local/441517340757@default-4350,2", "") in new stack
== Spawn extension (default, 441517340757, 3) exited non-zero on 'Local/441517340757@default-4350,2'
-- Executing DeadAGI("Local/441517340757@default-4350,2", "agi://127.0.0.1:4577/call_log--HVcauses--PRI-----NODEBUG-----1-----CONGESTION----------") in new stack
-- AGI Script
agi://127.0.0.1:4577/call_log--HVcauses ... ---------- completed, returning 0
== Manager 'sendcron' logged off from 127.0.0.1
-- SIP/netindia-084acea8 answered Local/441517331419@default-fb93,2
> Channel Local/441517331419@default-fb93,1 was answered.
-- Executing Answer("Local/441517331419@default-fb93,1", "") in new stack
-- Executing AGI("Local/441517331419@default-fb93,1", "agi://127.0.0.1:4577/call_log") in new stack
== Manager 'sendcron' logged off from 127.0.0.1
-- AGI Script
agi://127.0.0.1:4577/call_log completed, returning 0
-- Executing AGI("Local/441517331419@default-fb93,1", "agi-VDAD_ALL_outbound.agi|NORMAL-----LB") in new stack
-- Launched AGI Script /var/lib/asterisk/agi-bin/agi-VDAD_ALL_outbound.agi
== Spawn extension (default, 441517331419, 2) exited non-zero on 'Local/441517331419@default-fb93,2'
-- Executing DeadAGI("Local/441517331419@default-fb93,2", "agi://127.0.0.1:4577/call_log--HVcauses--PRI-----NODEBUG-----16-----ANSWER-----6-----0") in new stack
-- AGI Script
agi://127.0.0.1:4577/call_log--HVcauses ... ---6-----0 completed, returning 0
-- AGI Script agi-VDAD_ALL_outbound.agi completed, returning 0
-- Executing AGI("SIP/netindia-084acea8", "agi-VDAD_ALL_outbound.agi|NORMAL-----LB") in new stack
-- Launched AGI Script /var/lib/asterisk/agi-bin/agi-VDAD_ALL_outbound.agi
-- AGI Script agi-VDAD_ALL_outbound.agi completed, returning 0
-- Executing Goto("SIP/netindia-084acea8", "default|8600052|1") in new stack
-- Goto (default,8600052,1)
-- Executing MeetMe("SIP/netindia-084acea8", "8600052|F") in new stack
== Parsing '/etc/asterisk/manager.conf': Found
== Manager 'sendcron' logged on from 127.0.0.1
-- Executing MeetMe("Local/58600052@default-ed7a,2", "8600052|Fmq") in new stack
> Channel Local/58600052@default-ed7a,1 was answered.
-- Executing Answer("Local/58600052@default-ed7a,1", "") in new stack
-- Executing Monitor("Local/58600052@default-ed7a,1", "wav|20091118-183759_1517331419") in new stack
-- Executing Wait("Local/58600052@default-ed7a,1", "3600") in new stack
== Parsing '/etc/asterisk/manager.conf': Found
== Manager 'sendcron' logged on from 127.0.0.1
== Parsing '/etc/asterisk/manager.conf': Found
== Manager 'sendcron' logged on from 127.0.0.1
== Manager 'sendcron' logged off from 127.0.0.1
== Manager 'sendcron' logged off from 127.0.0.1
== Parsing '/etc/asterisk/manager.conf': Found
== Manager 'sendcron' logged on from 127.0.0.1
== Manager 'sendcron' logged off from 127.0.0.1
vici*CLI>
When i reboot the server it works for 3-4 calls and than again silence. means no voice of customer is hear..Even i m not able to hear "u r the only person in conference"