msc/USSD: add unknown request code testcase
The idea of this testcase is to check reaction of the network on
reception of USSD request with unknown/unhandled request code.
It is not clearly defined by the GSM specs, how the network
should react in such cases, but looking at GSM TS 04.80,
section 4.3.2 "Error types description", the UnexpectedDataValue
error looks suitable. Commercial networks also use this error
when an unknown request code is sent.
Change-Id: I6a3fcaafc37972a38c13722f0b511ea5e1e3fbd8
2 files changed