Support for "service category" in emergency calls
Right now, all emergency calls are routed to one specific MSISDN as configured in the VTY.
We should allow to configure one different phone number for each of the emergency service categories defined in "TS 24.008 10.5.4.33 Service category", such as police/ambulance/firebrigade/marineguard/mountainrescue.
This service category IE is an optional IE in the EMERGENCY SETUP message.
- VTY configuration allowing per-service numbers and a default number
- parsing of the optional IE
- TTCN3 tests encoding the IE and verifying the MSISDN routing based on VTY config