diff options
| -rw-r--r-- | openbsc/src/bssap.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/openbsc/src/bssap.c b/openbsc/src/bssap.c index f1b5bab7a..50dff9289 100644 --- a/openbsc/src/bssap.c +++ b/openbsc/src/bssap.c @@ -640,6 +640,7 @@ int dtap_rcvmsg(struct gsm_lchan *lchan, struct msgb *msg, unsigned int length) struct dtap_header *header; struct msgb *gsm48; u_int8_t *data; + u_int8_t link_id; if (!lchan) { DEBUGP(DMSC, "No lchan available\n"); @@ -693,7 +694,14 @@ int dtap_rcvmsg(struct gsm_lchan *lchan, struct msgb *msg, unsigned int length) } } - bts_queue_send(gsm48, header->link_id); + link_id = header->link_id; + + /* If we are on a TCH and need to submit a SMS (on SAPI=3) we need to use the SACH */ + if ((lchan->type == GSM_LCHAN_TCH_F || + lchan->type == GSM_LCHAN_TCH_H) && (link_id & 0x7) != 0) + link_id |= 0x40; + + bts_queue_send(gsm48, link_id); return 0; } |