An automated test tool has been deployed for both H.323 and SIP users.
Different numbers are available with different functions, such as the server time, your IP address, and echo test, in either SIP or H.323, and in a wide variety of codecs (G.711, Speex, ILBC etc)
Numbers are available for SRV-enabled and non-SRV-enabled clients, and for with both numeric and text IDs.
The numbers are all of the form:
prot = sip or h323 dest = time, addr, echo, tone, 2337, 8463 8063 or 3246 host = opalvoip.net (for SRV-enabled clients) or sip.opalvoip.net or h323.opalvoip.net
the destinations are:
time or 8463 announce the current server time addr or 2337 announce the clients (your) address tone or 8063 play a three element tone echo or 3246 enter an echo test
For example, the destination h323:firstname.lastname@example.org is a H.323 based echo test for a non-SRV client
BTW: if you are wondering where the numbers come from, look for how to spell "time", "addr", "echo" and "tone" on a standard keypad!