Can you explain the MMS call flow? I'm just wondering which
part of the flow causes 'Authentication Error'

Answer Posted / laji

Before landing the mms message on MMSC it is landing on
Radius server .Radius works the on AAA
(Authentication,Authorization, Accounting)here it verifies
for the particular MSISDN , if it not provisioned or
subscribed then it gives the error as 'Authentication
error'.

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