cisco 2651xm router
running sip trunk with 7940 phone
my sip provider has written to me complaining of multiple call attempts being made on my sip line. It's not me, my call log is fine showing only single-file calls that I recognise, there's been no toll fraud so I want to find out what is going on. My sip provider won't lift a finger to co-operate or provide further info so I need to run a debug on the sip trunk and output it to syslog. But I'm puzzled which debug command I should use, there are so many of them and I don't want to overload the router with unnecessary processing. Which debug command will show up toll fraud/concurrent call attempts? thanks for any advice.