diff --git a/src/host/layer23/include/osmocom/bb/mobile/support.h b/src/host/layer23/include/osmocom/bb/mobile/support.h
index 9af4d1b63..782b64065 100644
--- a/src/host/layer23/include/osmocom/bb/mobile/support.h
+++ b/src/host/layer23/include/osmocom/bb/mobile/support.h
@@ -10,6 +10,10 @@
 #define GSM_CIPHER_A5_7		6
 #define GSM_CIPHER_RESERVED	7
 
+#define GSM_CAP_SDCCH		0
+#define GSM_CAP_SDCCH_TCHF	1
+#define GSM_CAP_SDCCH_TCHF_TCHH	2
+
 struct gsm_support {
 	struct osmocom_ms *ms;
 
@@ -72,6 +76,7 @@ struct gsm_support {
 	uint8_t gps_conv;
 
 	/* radio */
+	uint8_t ch_cap; /* channel capability */
 	int8_t min_rxlev_db;
 	uint8_t scan_to;
 	uint8_t sync_to;
diff --git a/src/host/layer23/src/mobile/gsm48_rr.c b/src/host/layer23/src/mobile/gsm48_rr.c
index 21f86dd9b..9bb6ab172 100644
--- a/src/host/layer23/src/mobile/gsm48_rr.c
+++ b/src/host/layer23/src/mobile/gsm48_rr.c
@@ -960,6 +960,7 @@ static int gsm48_rr_rx_cm_enq(struct osmocom_ms *ms, struct msgb *msg)
 /* start random access */
 static int gsm48_rr_chan_req(struct osmocom_ms *ms, int cause, int paging)
 {
+	struct gsm_support *sup = &ms->support;
 	struct gsm48_rrlayer *rr = &ms->rrlayer;
 	struct gsm322_cellsel *cs = &ms->cellsel;
 	struct gsm48_sysinfo *s = cs->si;
@@ -1063,16 +1064,38 @@ cause = RR_EST_CAUSE_LOC_UPD;
 			chan_req_val);
 		break;
 	case RR_EST_CAUSE_ANS_PAG_TCH_F:
-		/* ms supports no dual rate */
-		chan_req_mask = 0x1f;
-		chan_req_val = 0x80;
+		switch (sup->ch_cap) {
+		case GSM_CAP_SDCCH_TCHF:
+			chan_req_mask = 0x1f;
+			chan_req_val = 0x80;
+			break;
+		case GSM_CAP_SDCCH_TCHF_TCHH:
+			chan_req_mask = 0x0f;
+			chan_req_val = 0x20;
+			break;
+		case GSM_CAP_SDCCH:
+			chan_req_mask = 0x0f;
+			chan_req_val = 0x10;
+			break;
+		}
 		LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (PAGING TCH/F)\n",
 			chan_req_val);
 		break;
 	case RR_EST_CAUSE_ANS_PAG_TCH_ANY:
-		/* ms supports no dual rate */
-		chan_req_mask = 0x1f;
-		chan_req_val = 0x80;
+		switch (sup->ch_cap) {
+		case GSM_CAP_SDCCH_TCHF:
+			chan_req_mask = 0x1f;
+			chan_req_val = 0x80;
+			break;
+		case GSM_CAP_SDCCH_TCHF_TCHH:
+			chan_req_mask = 0x0f;
+			chan_req_val = 0x30;
+			break;
+		case GSM_CAP_SDCCH:
+			chan_req_mask = 0x0f;
+			chan_req_val = 0x10;
+			break;
+		}
 		LOGP(DRR, LOGL_INFO, "CHANNEL REQUEST: %02x (PAGING TCH/H or "
 				"TCH/F)\n", chan_req_val);
 		break;
diff --git a/src/host/layer23/src/mobile/support.c b/src/host/layer23/src/mobile/support.c
index 40cf1b096..689065860 100644
--- a/src/host/layer23/src/mobile/support.c
+++ b/src/host/layer23/src/mobile/support.c
@@ -100,6 +100,7 @@ void gsm_support_init(struct osmocom_ms *ms)
 	//sup->sm_val = ;
 
 	/* radio */
+	sup->ch_cap = GSM_CAP_SDCCH_TCHF;
 	sup->min_rxlev_db = -100; // TODO
 	sup->sync_to = 6; /* how long to wait sync (0.9 s) */
 	sup->scan_to = 4; /* how long to wait for all sysinfos (>=4 s) */
@@ -148,6 +149,17 @@ void gsm_support_dump(struct gsm_support *sup,
 	print(priv, " A5/6     : %s\n", (sup->a5_6) ? "yes" : "no");
 	print(priv, " A5/7     : %s\n", (sup->a5_7) ? "yes" : "no");
 	print(priv, " A5/1     : %s\n", (sup->a5_1) ? "yes" : "no");
+	switch (sup->ch_cap) {
+		case GSM_CAP_SDCCH:
+		print(priv, " Channels : SDCCH only\n");
+		break;
+		case GSM_CAP_SDCCH_TCHF:
+		print(priv, " Channels : SDCCH + TCH/F\n");
+		break;
+		case GSM_CAP_SDCCH_TCHF_TCHH:
+		print(priv, " Channels : SDCCH + TCH/F + TCH/H\n");
+		break;
+	}
 	print(priv, " Min RXLEV: %d\n", sup->min_rxlev_db);
 }