Import (heavily modified) ipa_proto implementation from osmo-map-masq
Import (heavily modified) ipa_proto implementation from osmo-map-masq

The local changes here need to be synchronized back to the osmo-map-masq

aerosol/osmo_ss7,Shadytel/osmo_ss7,0x7678/osmo_ss7,systra/osmo_ss7,aerosol/osmo_ss7