ChanSpy Enforced Mode Problem

I have been trying to use ChanSpy dial plan application with enforced mode as shown below

exten => _44X.,1,ChanSpy(,e(SIP/6001:SIP/6002:SIP/6003:…:SIP/6100))

Though I am am able to spy , it seems that ChanSpy is able to monitor only first 30/31 devises mentioned at the enforced list.

So my question , is there any restriction on number of characters in the enforced mode list?
Thanks in advance.