diff --git a/include/osmocom/gsm/gsm_utils.h b/include/osmocom/gsm/gsm_utils.h
index 0fbfcba..1ffe579 100644
--- a/include/osmocom/gsm/gsm_utils.h
+++ b/include/osmocom/gsm/gsm_utils.h
@@ -196,6 +196,7 @@
 	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 18bee82..03337e7 100644
--- a/include/osmocom/gsm/protocol/gsm_08_58.h
+++ b/include/osmocom/gsm/protocol/gsm_08_58.h
@@ -305,6 +305,7 @@
 #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 @@
 #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 4e8e72b..3c3a2c9 100644
--- a/include/osmocom/gsm/protocol/gsm_12_21.h
+++ b/include/osmocom/gsm/protocol/gsm_12_21.h
@@ -539,6 +539,8 @@
 	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) */