Here we have an issue with the FAX machine which is configured in CUCM 8.5, physically located at Thailand ( On net DN 3083701, PSTN DN +822 344 03701 ). When we call this number either external or local we are getting busy tone... and the debugging logs are quite different in voice gateway.
When we call to +822 344 03701 we are getting this logs, We want to know why our voice gateway setting up the call 3 times or more than 3 times... Its strange.... Please let me know if you need any other logs from my end... :-)
The call is being attempted mutliple times from the gateway because it's receiving multiple SETUP messages from the PSTN. There's nothing wrong with the gateway.
As to why the PSTN would try an engaged number multiple times, I don't know. One vague possibility, is that maybe someone's setup a callback-type service on the number. But you'd probably need to talk to your PSTN provider. (You usually can't get this on ISDN type circuits, so maybe someone/thing is faking it by re-dialling frequently)
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