Hi, Marc.

This is possible, using the UDP Packet types that were introduced quietly in Version 3.20. There are some caveats:

* Requires UDP raw sockets - which works find in Windows XP, but under Vista/Win 7, intermediate TTL expired replies are quietly dropped by Windows, so intermediate hops won't show up on those OSes.
* If a packet is dropped, a warning message is displayed above the trace graph, "Response from instead of (server)". This message doesn't mean anything, but gets updated every lost packet.
* SIP OPTION packets are low priority on most servers, so it may not get a speedy reply. To an no-load local asterisk server here, we regularly see 30ms variations in reply time. Fair warning, I guess.

I've attached a packet format - download it and unzip it into your \Program Files\PingPlotter\UDPPacketTypes directory. Close / restart PingPlotter. Go change your packet type to UDP, then pick the "Fixed target port" type, then pick "SIP Options Ping". Try it out.

I've only tested this against Asterisk - and under Asterisk, the IAX ping might actually be a better choice, since it's sessionless request.

Please let us know if this works for you.

- Pete