Class of service Deny feature code Dial System Fax not working.

Created a class of service included an extension under it and denied the Dial System Fax (666) option and dialed 666 but the COS allows to dial and connects to System Fax. Attached Call log for reference.

 Executing [666@from-internal:1] Set("SIP/1992-00000080", "FAX_RX_EMAIL=") in new stack
    -- Executing [666@from-internal:2] Goto("SIP/1992-00000080", "ext-fax,s,1") in new stack
    -- Goto (ext-fax,s,1)
    -- Executing [s@ext-fax:1] Macro("SIP/1992-00000080", "user-callerid,") in new stack
    -- Executing [s@macro-user-callerid:1] Set("SIP/1992-00000080", "TOUCH_MONITOR=1500029203.329") in new stack
    -- Executing [s@macro-user-callerid:2] Set("SIP/1992-00000080", "AMPUSER=1992") in new stack
    -- Executing [s@macro-user-callerid:3] GotoIf("SIP/1992-00000080", "0?report") in new stack
    -- Executing [s@macro-user-callerid:4] ExecIf("SIP/1992-00000080", "1?Set(__REALCALLERIDNUM=1992)") in new stack
    -- Executing [s@macro-user-callerid:5] Set("SIP/1992-00000080", "AMPUSER=1992") in new stack
    -- Executing [s@macro-user-callerid:6] GotoIf("SIP/1992-00000080", "0?limit") in new stack
    -- Executing [s@macro-user-callerid:7] Set("SIP/1992-00000080", "AMPUSERCIDNAME=Sandesh 1992") in new stack
    -- Executing [s@macro-user-callerid:8] GotoIf("SIP/1992-00000080", "0?report") in new stack
    -- Executing [s@macro-user-callerid:9] Set("SIP/1992-00000080", "AMPUSERCID=1992") in new stack
    -- Executing [s@macro-user-callerid:10] Set("SIP/1992-00000080", "__DIAL_OPTIONS=Ttr") in new stack
    -- Executing [s@macro-user-callerid:11] Set("SIP/1992-00000080", "CALLERID(all)="Sandesh 1992" <1992>") in new stack
    -- Executing [s@macro-user-callerid:12] GotoIf("SIP/1992-00000080", "0?limit") in new stack
    -- Executing [s@macro-user-callerid:13] ExecIf("SIP/1992-00000080", "0?Set(GROUP(concurrency_limit)=1992)") in new stack
    -- Executing [s@macro-user-callerid:14] GosubIf("SIP/1992-00000080", "7?sub-ccss,s,1(ext-fax,666)") in new stack
    -- Executing [s@sub-ccss:1] ExecIf("SIP/1992-00000080", "0?Return()") in new stack
    -- Executing [s@sub-ccss:2] Set("SIP/1992-00000080", "CCSS_SETUP=TRUE") in new stack
    -- Executing [s@sub-ccss:3] GosubIf("SIP/1992-00000080", "0?monitor_config,1(ext-fax,666):monitor_default,1(ext-fax,666)") in new stack
    -- Executing [monitor_default@sub-ccss:1] GotoIf("SIP/1992-00000080", "0?is_exten") in new stack
    -- Executing [monitor_default@sub-ccss:2] StackPop("SIP/1992-00000080", "") in new stack
    -- Executing [monitor_default@sub-ccss:3] Return("SIP/1992-00000080", "FALSE") in new stack
    -- Executing [s@macro-user-callerid:15] ExecIf("SIP/1992-00000080", "0?Set(CHANNEL(language)=)") in new stack
    -- Executing [s@macro-user-callerid:16] GotoIf("SIP/1992-00000080", "0?continue") in new stack
    -- Executing [s@macro-user-callerid:17] ExecIf("SIP/1992-00000080", "1?Set(__CALLEE_ACCOUNCODE=)") in new stack
    -- Executing [s@macro-user-callerid:18] Set("SIP/1992-00000080", "__TTL=6") in new stack
    -- Executing [s@macro-user-callerid:19] GotoIf("SIP/1992-00000080", "1?continue") in new stack
    -- Goto (macro-user-callerid,s,30)
    -- Executing [s@macro-user-callerid:30] Set("SIP/1992-00000080", "CALLERID(number)=1992") in new stack
    -- Executing [s@macro-user-callerid:31] Set("SIP/1992-00000080", "CALLERID(name)=Sandesh 1992") in new stack
    -- Executing [s@macro-user-callerid:32] GotoIf("SIP/1992-00000080", "0?cnum") in new stack
    -- Executing [s@macro-user-callerid:33] Set("SIP/1992-00000080", "CDR(cnam)=Sandesh 1992") in new stack
    -- Executing [s@macro-user-callerid:34] Set("SIP/1992-00000080", "CDR(cnum)=1992") in new stack
    -- Executing [s@macro-user-callerid:35] Set("SIP/1992-00000080", "CHANNEL(language)=en") in new stack
    -- Executing [s@macro-user-callerid:36] ExecIf("SIP/1992-00000080", "0?Set(CALLERID(name)=)") in new stack
    -- Executing [s@macro-user-callerid:37] GosubIf("SIP/1992-00000080", "0?app-check-classofservce,s,1()") in new stack
    -- Executing [s@ext-fax:2] NoOp("SIP/1992-00000080", "Receiving Fax for:  , From: "Sandesh 1992" <1992>") in new stack
    -- Executing [s@ext-fax:3] StopPlayTones("SIP/1992-00000080", "") in new stack
    -- Executing [s@ext-fax:4] ReceiveFAX("SIP/1992-00000080", "/var/spool/asterisk/fax/1500029203.329.tif,f") in new stack
    -- Channel 'SIP/1992-00000080' receiving FAX '/var/spool/asterisk/fax/1500029203.329.tif'
       > 0x7ff7cc0a8880 -- Probation passed - setting RTP source address to 192.168.3.132:12160
  == Spawn extension (ext-fax, s, 4) exited non-zero on 'SIP/1992-00000080'
    -- Executing [h@ext-fax:1] GotoIf("SIP/1992-00000080", "1?failed") in new stack
    -- Goto (ext-fax,h,104)
    -- Executing [h@ext-fax:104] NoOp("SIP/1992-00000080", "FAX FAILED for:  , From: "Sandesh 1992" <1992>") in new stack
    -- Executing [h@ext-fax:105] Macro("SIP/1992-00000080", "hangupcall,") in new stack
    -- Executing [s@macro-hangupcall:1] GotoIf("SIP/1992-00000080", "1?theend") in new stack
    -- Goto (macro-hangupcall,s,3)
    -- Executing [s@macro-hangupcall:3] ExecIf("SIP/1992-00000080", "0?Set(CDR(recordingfile)=)") in new stack
    -- Executing [s@macro-hangupcall:4] Hangup("SIP/1992-00000080", "") in new stack
  == Spawn extension (macro-hangupcall, s, 4) exited non-zero on 'SIP/1992-00000080' in macro 'hangupcall'
  == Spawn extension (ext-fax, h, 105) exited non-zero on 'SIP/1992-00000080