asterisk users - Jan 2014 - How to get ringing sound in outbound call in asterisk

I have two server

Server_A(outbound call) for agent login and agent make a outbound call from
here and pass into server Server_B call

extension.conf

exten => _91XX.,1,AGI(agi://127.0.0.1:4577/call_log)
exten => _91XX.,n,Dial(SIP/${EXTEN}@192.168.53.197,,tToR)
exten => _91XX.,n,hangup()


Server_B[192.168.53.197] for call forwarding

extension.conf

exten => _911X.,1,ChanisAvail(${TRUNK_GRP3})
exten => _911X.,2,gotoif($["${AVAILCHAN}" =
""]?lbl_busy:)
exten =>
_911X.,n,Set(CALLTIME=${STRFTIME(${EPOCH},Asia/Calcutta,%d-%b-%Y-%H-%M-%S)})
exten =>
_911X.,n,Gotoif($["${RECORDING_ENABLED}"="Y"]?lbl_dbc:lbl_dial)
exten =>
_911X.,n(lbl_dbc),Set(RECSUBDIR=${STRFTIME(${EPOCH},Asia/Calcutta,%d%b%Y)})
exten => _911X.,n,Set(CALLERID(num)=${IDGCLI})
exten => _911X.,n,Set(FILENAME=${IDGTERMINAL}_${EXTEN:1}_${CALLTIME}.WAV)
exten => _911X.,n,Set(RECORDFILENAME=${RECSUBDIR}/${FILENAME})
exten =>
_911X.,n,Gotoif($["${IDGCALL}"=""]?lbl_setcall:lbl_sendevent)
exten => _911X.,n(lbl_setcall),Set(IDGCALL=0)
exten =>
_911X.,n(lbl_sendevent),Gotoif($["${DBTYPE}"="SQL"]?lbl_sql:)
exten =>
_911X.,n,Gotoif($["${DBTYPE}"="MYSQL"]?lbl_mysql:lbl_record)
exten => _911X.,n(lbl_sql),UserEvent(${CHANNEL}$DBEXEC$EXEC
udsp_vlog_start_record
'${CHANNEL}'#'${IDGTERMINAL}'#'${EXTEN:1}'#'${FILENAME}'#'${UNIQUEID}'#'${CALLERID(num)}'#'O'#${VLOGSERVER}#'${HTTPPATH}${RECORDFILENAME}'#${IDGCALL}$)
exten => _911X.,n,Goto(lbl_record)
exten => _911X.,n(lbl_mysql),UserEvent(${CHANNEL}$DBEXEC$CALL
udsp_vlog_start_record
('${CHANNEL}'#'${IDGTERMINAL}'#'${EXTEN:1}'#'${FILENAME}'#'${UNIQUEID}'#'${CALLERID(num)}'#'O'#${VLOGSERVER}#'${HTTPPATH}${RECORDFILENAME}'#${IDGCALL})$)
exten =>
_911X.,n(lbl_record),MixMonitor(${RECORDING_PATH_OUT_SREI}${RECORDFILENAME})
exten => _911X.,n(lbl_dial),Set(ChanLength=${LEN(${AVAILCHAN})})
exten => _911X.,n,Set(NewChannel=${AVAILCHAN:0:$[${ChanLength}-2]})
exten => _911X.,n,Dial(${NewChannel}/${EXTEN:3},,tToR)
exten => _911X.,n,hangup()
exten => _911X.,n(lbl_busy),Busy()


I'm not able listened ringing sound when i make outbound call.

Regards
Akhilesh
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