Greetings
I have a Sip trunk between a CUCM and an Asterisk
When the call enter to my ISR gateway then go to the CUCM and finally reach the Asterisk I do not have ringback
when I look at the trace I see that the Asterisk tries to reach the ISR gateway and does not return to the CUCM,
I have the "MTP Required" option enabled,
I attach the screenshots
THANKS
