| #pragma once |
| |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/msc/gsm_data.h> |
| #include <osmocom/msc/transaction.h> |
| |
| /* These are the interfaces of the MSC layer towards (from?) the BSC and RNC, |
| * i.e. in the direction towards the mobile device (MS aka UE). |
| * |
| * 2G will use the A-interface, |
| * 3G aka UMTS will use the Iu-interface (for the MSC, it's IuCS). |
| * |
| * To allow linking parts of the MSC code without having to include entire |
| * infrastructures of external libraries, the core transmitting and receiving |
| * functions are left unimplemented. For example, a unit test does not need to |
| * link against external ASN1 libraries if it is never going to encode actual |
| * outgoing messages. It is up to each building scope to implement real world |
| * functions or to plug mere dummy implementations. |
| * |
| * For example, msc_tx_dtap(conn, msg), depending on conn->via_iface, will call |
| * either iu_tx() or a_tx() [note: at time of writing, the A-interface is not |
| * yet implemented]. When you try to link against libmsc, you will find that |
| * the compiler complains about an undefined reference to iu_tx(). If you, |
| * however, link against libiu as well as the osmo-iuh libs (etc.), iu_tx() is |
| * available. A unit test may instead simply implement a dummy iu_tx() function |
| * and not link against osmo-iuh, see tests/libiudummy/. |
| */ |
| |
| /* Each main linkage must implement this function (see comment above). */ |
| extern int iu_tx(struct msgb *msg, uint8_t sapi); |
| |
| int msc_tx_dtap(struct ran_conn *conn, |
| struct msgb *msg); |
| |
| int msc_gsm48_tx_mm_serv_ack(struct ran_conn *conn); |
| int msc_gsm48_tx_mm_serv_rej(struct ran_conn *conn, |
| enum gsm48_reject_value value); |
| |
| int msc_tx_common_id(struct ran_conn *conn); |