Outbound digit length?

Call test thru PRI to this number 12345+1234+85212345678 (total 20 dig.) is work. However, if call to 12345+1234+852123456789 (total 21 dig.) the call will failed in the server “Release code 3”. Any digit length limitaion ?

The maximum length of an international DN is 15 digits, if the endpoint is private that can be extended by that endpoint but “cause 3” means that the endpoint that took the call cannot resolve your dialed number. You need to check with whoever is responsible for handling that part of the dial string that is not e164 compliant, it would presumably be a private system.