diff --git a/openbsc/include/openbsc/gsm_data.h b/openbsc/include/openbsc/gsm_data.h
index a36083a..e9ba173 100644
--- a/openbsc/include/openbsc/gsm_data.h
+++ b/openbsc/include/openbsc/gsm_data.h
@@ -360,7 +360,7 @@
 		enum rrlp_mode mode;
 	} rrlp;
 
-	enum gsm_chan_t ctype_by_chreq[16];
+	enum gsm_chan_t ctype_by_chreq[18];
 
 	/* Use a TCH for handling requests of type paging any */
 	int pag_any_tch;
diff --git a/openbsc/include/openbsc/gsm_data_shared.h b/openbsc/include/openbsc/gsm_data_shared.h
index 7c469ee..e697cb8 100644
--- a/openbsc/include/openbsc/gsm_data_shared.h
+++ b/openbsc/include/openbsc/gsm_data_shared.h
@@ -46,6 +46,7 @@
 	GSM_CHREQ_REASON_CALL,
 	GSM_CHREQ_REASON_LOCATION_UPD,
 	GSM_CHREQ_REASON_OTHER,
+	GSM_CHREQ_REASON_PDCH,
 };
 
 /* lchans 0..3 are SDCCH in combined channel configuration,
diff --git a/openbsc/src/libbsc/gsm_04_08_utils.c b/openbsc/src/libbsc/gsm_04_08_utils.c
index 4a53b31..db9dabb 100644
--- a/openbsc/src/libbsc/gsm_04_08_utils.c
+++ b/openbsc/src/libbsc/gsm_04_08_utils.c
@@ -75,7 +75,11 @@
 	{ 0x67, 0xff, CHREQ_T_LMU },
 	{ 0x60, 0xf9, CHREQ_T_RESERVED_SDCCH },
 	{ 0x61, 0xfb, CHREQ_T_RESERVED_SDCCH },
-	{ 0x63,	0xff, CHREQ_T_RESERVED_SDCCH },
+	{ 0x63, 0xff, CHREQ_T_RESERVED_SDCCH },
+	{ 0x70, 0xf8, CHREQ_T_PDCH_TWO_PHASE },
+	{ 0x78, 0xfc, CHREQ_T_PDCH_ONE_PHASE },
+	{ 0x78, 0xfa, CHREQ_T_PDCH_ONE_PHASE },
+	{ 0x78, 0xf9, CHREQ_T_PDCH_ONE_PHASE },
 	{ 0x7f, 0xff, CHREQ_T_RESERVED_IGNORE },
 };
 
@@ -92,7 +96,11 @@
 	{ 0x67, 0xff, CHREQ_T_LMU },
 	{ 0x60, 0xf9, CHREQ_T_RESERVED_SDCCH },
 	{ 0x61, 0xfb, CHREQ_T_RESERVED_SDCCH },
-	{ 0x63,	0xff, CHREQ_T_RESERVED_SDCCH },
+	{ 0x63, 0xff, CHREQ_T_RESERVED_SDCCH },
+	{ 0x70, 0xf8, CHREQ_T_PDCH_TWO_PHASE },
+	{ 0x78, 0xfc, CHREQ_T_PDCH_ONE_PHASE },
+	{ 0x78, 0xfa, CHREQ_T_PDCH_ONE_PHASE },
+	{ 0x78, 0xf9, CHREQ_T_PDCH_ONE_PHASE },
 	{ 0x7f, 0xff, CHREQ_T_RESERVED_IGNORE },
 };
 
@@ -112,6 +120,8 @@
 	[CHREQ_T_PAG_R_TCH_FH]		= GSM_LCHAN_TCH_F,
 	[CHREQ_T_LMU]			= GSM_LCHAN_SDCCH,
 	[CHREQ_T_RESERVED_SDCCH]	= GSM_LCHAN_SDCCH,
+	[CHREQ_T_PDCH_ONE_PHASE]	= GSM_LCHAN_PDTCH,
+	[CHREQ_T_PDCH_TWO_PHASE]	= GSM_LCHAN_PDTCH,
 	[CHREQ_T_RESERVED_IGNORE]	= GSM_LCHAN_UNKNOWN,
 };
 
@@ -130,6 +140,8 @@
 	[CHREQ_T_PAG_R_TCH_F]		= GSM_CHREQ_REASON_PAG,
 	[CHREQ_T_PAG_R_TCH_FH]		= GSM_CHREQ_REASON_PAG,
 	[CHREQ_T_LMU]			= GSM_CHREQ_REASON_OTHER,
+	[CHREQ_T_PDCH_ONE_PHASE]	= GSM_CHREQ_REASON_PDCH,
+	[CHREQ_T_PDCH_TWO_PHASE]	= GSM_CHREQ_REASON_PDCH,
 	[CHREQ_T_RESERVED_SDCCH]	= GSM_CHREQ_REASON_OTHER,
 	[CHREQ_T_RESERVED_IGNORE]	= GSM_CHREQ_REASON_OTHER,
 };