First of all sipp option pingreply automatically answers PING requests, but there's no such request in SIP RFC.
But when I changed that to automatically answer an OPTIONS request I saw that one is answered but the next is not, and I suspect that it's because of the pause command in my script.
There's also no indication that the second OPTIONS was seen by sipp in the errors and messages logs.
Thanks
I think that actually the problem is not due to the pause command because the first OPTIONS message also arrives after the pause command was called