c# - tapisrv.exe hangs other processes when terminating from a developed program -

so i've developed program in c# in vs2013 utilizes tapi make phone call on 1 button. used tapi3 library, after discovering not in working state switched julmar's tapi 2 wrapper. i'm using windows 8 64 bit, , although program used elsewhere on win8 64 bit machines issue occur.

whenever make phone call program, nothing abnormal happens , phone call made. code runs , ok. when close form tapi used (i.e terminating tapisrv.exe) service shuts down, , drags other processes every time. interfering drive mappings, cryptography services , other services depending on pc. error log in event viewer below;

faulting application name: svchost.exe_tapisrv, version: 6.3.9600.17415, time stamp: 0x54504177

faulting module name: ntdll.dll, version: 6.3.9600.18007, time stamp: 0x55c4c16b

exception code: 0xc0000008

fault offset: 0x000000000009311a

faulting process id: 0xd4

faulting application start time: 0x01d0f45613fffb86

faulting application path: c:\windows\system32\svchost.exe

faulting module path: c:\windows\system32\ntdll.dll

report id: 41b6967a-604a-11e5-829f-f8b156d8c3e7

faulting package full name:

faulting package-relative application id:

i information bubble following following information:

fault bucket , type 0

event name: appcrash

response: not available

cab id: 0

problem signature:

p1: svchost.exe_tapisrv

p2: 6.3.9600.17415

p3: 54504177

p4: ntdll.dll

p5: 6.3.9600.18007

p6: 55c4c16b

p7: c0000008

p8: 000000000009311a

p9:

p10:

attached files:

c:\windows\serviceprofiles\networkservice\appdata\local\temp\were5b1.tmp.appcompat.txt

c:\windows\serviceprofiles\networkservice\appdata\local\temp\were5d1.tmp.werinternalmetadata.xml

c:\programdata\microsoft\windows\wer\reportqueue\appcrash_svchost.exe_tapi_881875fa9eb711f34fe5d53182d2b0c47578647_f1915213_cab_053de5df\memory.hdmp

c:\programdata\microsoft\windows\wer\reportqueue\appcrash_svchost.exe_tapi_881875fa9eb711f34fe5d53182d2b0c47578647_f1915213_cab_053de5df\triagedump.dmp

these files may available here:

c:\programdata\microsoft\windows\wer\reportqueue\appcrash_svchost.exe_tapi_881875fa9eb711f34fe5d53182d2b0c47578647_f1915213_cab_053de5df

analysis symbol:

rechecking solution: 0

report id: 41b6967a-604a-11e5-829f-f8b156d8c3e7

report status: 4

hashed bucket:

has seen before? doing wrong? know other issues exist regarding tapi on win8 64 bit cant seem find specific problem.

thanks in advance.

my guess: have buggy tsp crashes service when tapi uninitialized.

i know no such crashes tapi. if crash happens inside service there tsp involved in such problems.

1. try run tapi service isolated in own service host. prevent troubles when service crashes.
2. open created dmp files vs received , check dll / code causes crash.