diff --git a/include/osmocom/gsm/gsm_utils.h b/include/osmocom/gsm/gsm_utils.h
index 0fbfcba8a..1ffe5797a 100644
--- a/include/osmocom/gsm/gsm_utils.h
+++ b/include/osmocom/gsm/gsm_utils.h
@@ -196,6 +196,7 @@ enum gsm_phys_chan_config {
 	GSM_PCHAN_UNKNOWN,
 	GSM_PCHAN_CCCH_SDCCH4_CBCH,
 	GSM_PCHAN_SDCCH8_SACCH8C_CBCH,
+	GSM_PCHAN_TCH_F_TCH_H_PDCH,
 	_GSM_PCHAN_MAX
 };
 
diff --git a/include/osmocom/gsm/protocol/gsm_08_58.h b/include/osmocom/gsm/protocol/gsm_08_58.h
index 18bee823b..03337e7ee 100644
--- a/include/osmocom/gsm/protocol/gsm_08_58.h
+++ b/include/osmocom/gsm/protocol/gsm_08_58.h
@@ -305,6 +305,7 @@ enum abis_rsl_ie {
 #define RSL_CHAN_BCCH		0x80
 #define RSL_CHAN_RACH		0x88
 #define RSL_CHAN_PCH_AGCH	0x90
+#define RSL_CHAN_OSMO_PDCH	0xc0	/*< non-standard, for dyn TS */
 
 /* Chapter 9.3.3 */
 #define RSL_ACT_TYPE_INITIAL	0x00
@@ -315,6 +316,7 @@ enum abis_rsl_ie {
 #define RSL_ACT_INTER_SYNC	0x03
 #define RSL_ACT_SECOND_ADD	0x04
 #define RSL_ACT_SECOND_MULTI	0x05
+#define RSL_ACT_OSMO_PDCH	0x0f	/*< non-standard, for dyn TS */
 
 /*! \brief RSL Channel Mode IF (Chapter 9.3.6) */
 struct rsl_ie_chan_mode {
diff --git a/include/osmocom/gsm/protocol/gsm_12_21.h b/include/osmocom/gsm/protocol/gsm_12_21.h
index 4e8e72b97..3c3a2c914 100644
--- a/include/osmocom/gsm/protocol/gsm_12_21.h
+++ b/include/osmocom/gsm/protocol/gsm_12_21.h
@@ -539,6 +539,8 @@ enum abis_nm_chan_comb {
 	NM_CHANC_IPAC_PDCH	= 0x0d,	/* PDTCH/F + PACCH/F + PTCCH/F */
 	NM_CHANC_IPAC_TCHFull_PDCH = 0x80,
 	NM_CHANC_IPAC_TCHFull_TCHHalf = 0x81,
+	/* osmocom */
+	NM_CHANC_OSMO_TCHFull_TCHHalf_PDCH = 0x90,
 };
 
 /*! \brief Event Type (Section 9.4.16) */
diff --git a/src/gsm/abis_nm.c b/src/gsm/abis_nm.c
index 6a1831c71..e607d30f2 100644
--- a/src/gsm/abis_nm.c
+++ b/src/gsm/abis_nm.c
@@ -438,6 +438,7 @@ static const enum abis_nm_chan_comb chcomb4pchan[] = {
 	[GSM_PCHAN_UNKNOWN]	= 0xff,
 	[GSM_PCHAN_CCCH_SDCCH4_CBCH]	= NM_CHANC_BCCH_CBCH,
 	[GSM_PCHAN_SDCCH8_SACCH8C_CBCH] = NM_CHANC_SDCCH_CBCH,
+	[GSM_PCHAN_TCH_F_TCH_H_PDCH]	= NM_CHANC_OSMO_TCHFull_TCHHalf_PDCH,
 	/* FIXME: bounds check */
 };