If we're trying to allocate TCH/H but don't have it, fallback to TCH/F
The rationale is as following:
If we have NECI=1, then the phone will request a channel with CHREQ
"0100xxxx Originating speech call from dual-rate mobile station when TCH/H is
sufficient and supported by the MS for speech calls", then we will try to
allocate a TCH/H [as it is sufficient].
However, if there are no free TCH/H slots on the BTS, we abandon and can't
handle the MO call at all :(
diff --git a/openbsc/src/chan_alloc.c b/openbsc/src/chan_alloc.c
index 7ba679c..6bf65f3 100644
--- a/openbsc/src/chan_alloc.c
+++ b/openbsc/src/chan_alloc.c
@@ -203,6 +203,9 @@
break;
case GSM_LCHAN_TCH_H:
lchan =_lc_find_bts(bts, GSM_PCHAN_TCH_H);
+ /* If we don't have TCH/H available, fall-back to TCH/F */
+ if (!lchan)
+ lchan = _lc_find_bts(bts, GSM_PCHAN_TCH_F);
break;
default:
fprintf(stderr, "Unknown gsm_chan_t %u\n", type);