cat and grep not working

I am trying to cat a file and then grep that file for a number. I can do it fine on other files but this particular file will not do anything. I tried running it on an older file from the same device but it is just not working. The file is nothing more than a flat file on a unix box. Here is just a excerpt from the file:

IS,1220765291,c2e8e7b4-1dd1-11b2-b9a0-b03162323164,c2e8e7b4,31682826ca58247fdd2326c5315f8150,11252640,SIP,SIP,sip:2263735572@10.120.0.60:5060,13,NumB,F,NamB,F,Name,,SubExtn,,VarId,,BillCode,,CallingPartyType,2,PhNm,2263735572,CallType,Unknown,Rsid,e2d38bf4-1dd1-11b2-b99b-b03162323164,DEPT,,auth_ext,,auth_pin,,,PU,2263735572,,audio,cs-active,1
IS,1220765291,c2e8e7b4-1dd1-11b2-b9a0-b03162323164,c2e9ad66,8ae8375098bb9f65e27b33ada76964e4,11252641,SIP,convedia,,13,NumB,F,NamB,F,Name,,SubExtn,,CalledPartyType,2,PhNm,annc,CallAppType,,CallAppId,,CallType,Unknown,RedT,2,ClgSvcNm,,Rsid,e2d38bf4-1dd1-11b2-b99b-b03162323164,DEPT,,,PU,annc,,audio,cs-active,2
ST,1220765298,c2e8e7b4-1dd1-11b2-b9a0-b03162323164,c2e8e7b4,31682826ca58247fdd2326c5315f8150,11252642,SIP,SIP,sip:2263735572@10.120.0.60:5060,0,NOTFOUND,0
ST,1220765298,c2e8e7b4-1dd1-11b2-b9a0-b03162323164,c2e9ad66,fe6fe8dae8c83ea31d0c37d767c07663,11252643,SIP,convedia,convedia01,0,NOTFOUND,0
ST,1220794274,f758e312-1dd1-11b2-b9a5-b03162323164,f759c390,52b0e6827e79cfb5a82c82f420126f94,11252740,SIP,SIP,sip:3194430507-ujg2cfog3lni8@10.120.1.100:5060,0,NORMAL,0       

I tried grepping in several manners with no luck Any ideas?

What did you try? What did it say? Errors? More info please.

if I enter in cat filename | grep 'searched text' it comes back with nothing
if I enter in grep 'searched text' filename it comes back with nothing

Its not giving any errors. I can do it on other files just fine. It is very strange.

# cat ll.txt

IS,1220765291,c2e8e7b4-1dd1-11b2-b9a0-b03162323164,c2e8e7b4,31682826ca58247fdd2326c5315f8150,11252640,SIP,SIP,sip:2263735572@10.120.0.60:5
060,13,NumB,F,NamB,F,Name,,SubExtn,,VarId,,BillCode,,CallingPartyType,2,PhNm,2263735572,CallType,Unk
nown,Rsid,e2d38bf4-1dd1-11b2-b99b-b03162323164,DEPT,,auth_ext,,auth_pin,,,PU,2263735572,,audio,cs-active,1
IS,1220765291,c2e8e7b4-1dd1-11b2-b9a0-b03162323164,c2e9ad66,8ae8375098bb9f65e27b33ada76964e4,11252641,SIP,convedia,,13,NumB,F,NamB,F,Name,
,SubExtn,,CalledPartyType,2,PhNm,annc,CallAppType,,CallAppId,,CallType,Unknown,RedT,2,ClgSvcNm,,Rsid
,e2d38bf4-1dd1-11b2-b99b-b03162323164,DEPT,,,PU,annc,,audio,cs-active,2
ST,1220765298,c2e8e7b4-1dd1-11b2-b9a0-b03162323164,c2e8e7b4,31682826ca58247fdd2326c5315f8150,11252642,SIP,SIP,sip:2263735572@10.120.0.60:5
060,0,NOTFOUND,0
ST,1220765298,c2e8e7b4-1dd1-11b2-b9a0-b03162323164,c2e9ad66,fe6fe8dae8c83ea31d0c37d767c07663,11252643,SIP,convedia,convedia01,0,NOTFOUND,0
ST,1220794274,f758e312-1dd1-11b2-b9a5-b03162323164,f759c390,52b0e6827e79cfb5a82c82f420126f94,11252740,SIP,SIP,sip:3194430507-ujg2cfog3lni8@10.120.1.100:5060,0,NORMAL,0


# cat ll.txt | grep 11252642
ST,1220765298,c2e8e7b4-1dd1-11b2-b9a0-b03162323164,c2e8e7b4,31682826ca58247fdd2326c5315f8150,11252642,SIP,SIP,sip:2263735572@10.120.0.60:5

# grep "11252642" ll.txt
ST,1220765298,c2e8e7b4-1dd1-11b2-b9a0-b03162323164,c2e8e7b4,31682826ca58247fdd2326c5315f8150,11252642,SIP,SIP,sip:2263735572@10.120.0.60:5