diff --git a/include/osmocom/abis/e1_input.h b/include/osmocom/abis/e1_input.h
index 9562928..757f3f2 100644
--- a/include/osmocom/abis/e1_input.h
+++ b/include/osmocom/abis/e1_input.h
@@ -126,15 +126,23 @@ struct e1inp_driver {
 	struct llist_head list;
 	const char *name;
 	int (*want_write)(struct e1inp_ts *ts);
-	int (*line_update)(struct e1inp_line *line, enum e1inp_line_role role, const char *addr);
+	int (*line_update)(struct e1inp_line *line);
 	void (*close)(struct e1inp_sign_link *link);
 	int default_delay;
 };
 
 struct e1inp_line_ops {
-	enum e1inp_line_role	role;
-	char			*addr;
-	void			*data;
+	union {
+		struct {
+			enum e1inp_line_role role;	/* BSC or BTS mode. */
+			const char *addr;		/* IP address .*/
+			void *dev;			/* device parameters. */
+		} ipa;
+		struct {
+			const char *port;		/* e.g. /dev/ttyUSB0 */
+			unsigned int delay;
+		} rs232;
+	} cfg;
 
 	struct e1inp_sign_link *	(*sign_link_up)(void *unit_info, struct e1inp_line *line, enum e1inp_sign_type type);
 	void	(*sign_link_down)(struct e1inp_line *line);
diff --git a/src/e1_input.c b/src/e1_input.c
index 22f38d8..81c5a99 100644
--- a/src/e1_input.c
+++ b/src/e1_input.c
@@ -610,8 +610,7 @@ int e1inp_line_update(struct e1inp_line *line)
 		return 0;
 
 	if (line->driver && line->ops && line->driver->line_update) {
-		rc = line->driver->line_update(line, line->ops->role,
-						line->ops->addr);
+		rc = line->driver->line_update(line);
 	} else
 		rc = 0;
 
diff --git a/src/input/dahdi.c b/src/input/dahdi.c
index 1b366e1..e4e4905 100644
--- a/src/input/dahdi.c
+++ b/src/input/dahdi.c
@@ -385,8 +385,7 @@ static int dahdi_fd_cb(struct osmo_fd *bfd, unsigned int what)
 	return rc;
 }
 
-static int dahdi_e1_line_update(struct e1inp_line *line,
-				enum e1inp_line_role role, const char *addr);
+static int dahdi_e1_line_update(struct e1inp_line *line);
 
 struct e1inp_driver dahdi_driver = {
 	.name = "dahdi",
@@ -501,8 +500,7 @@ static int dahdi_e1_setup(struct e1inp_line *line)
 	return 0;
 }
 
-static int dahdi_e1_line_update(struct e1inp_line *line,
-				enum e1inp_line_role role, const char *addr)
+static int dahdi_e1_line_update(struct e1inp_line *line)
 {
 	if (line->driver != &dahdi_driver)
 		return -EINVAL;
diff --git a/src/input/hsl.c b/src/input/hsl.c
index ab822c0..dc7532b 100644
--- a/src/input/hsl.c
+++ b/src/input/hsl.c
@@ -318,8 +318,7 @@ static void hsl_close(struct e1inp_sign_link *sign_link)
 	}
 }
 
-static int hsl_line_update(struct e1inp_line *line,
-			   enum e1inp_line_role role, const char *addr);
+static int hsl_line_update(struct e1inp_line *line);
 
 struct e1inp_driver hsl_driver = {
 	.name = "hsl",
@@ -421,7 +420,7 @@ static int hsl_bts_connect(struct ipa_client_link *link)
 	struct msgb *msg;
 	uint8_t *serno;
 	char serno_buf[16];
-	struct hsl_unit *unit = link->line->ops->data;
+	struct hsl_unit *unit = link->line->ops->cfg.ipa.dev;
 	struct e1inp_sign_link *sign_link;
 
 	/* send the minimal message to identify this BTS. */
@@ -457,17 +456,17 @@ static int hsl_bts_connect(struct ipa_client_link *link)
 	return 0;
 }
 
-static int hsl_line_update(struct e1inp_line *line,
-			   enum e1inp_line_role role, const char *addr)
+static int hsl_line_update(struct e1inp_line *line)
 {
 	int ret = -ENOENT;
 
-	switch(role) {
+	switch(line->ops->cfg.ipa.role) {
 	case E1INP_LINE_R_BSC:
 		LOGP(DLINP, LOGL_NOTICE, "enabling hsl BSC mode\n");
 
 		ret = osmo_sock_init(AF_INET, SOCK_STREAM, IPPROTO_TCP,
-				     addr, HSL_TCP_PORT, OSMO_SOCK_F_BIND);
+				     line->ops->cfg.ipa.addr,
+				     HSL_TCP_PORT, OSMO_SOCK_F_BIND);
 		if (ret < 0)
 			return ret;
 
@@ -489,7 +488,8 @@ static int hsl_line_update(struct e1inp_line *line,
 		link = ipa_client_link_create(tall_hsl_ctx,
 					      &line->ts[E1INP_SIGN_OML-1],
 					      "hsl", E1INP_SIGN_OML,
-					      addr, HSL_TCP_PORT,
+					      line->ops->cfg.ipa.addr,
+					      HSL_TCP_PORT,
 					      hsl_bts_connect,
 					      hsl_bts_process,
 					      hsl_bts_write,
diff --git a/src/input/ipaccess.c b/src/input/ipaccess.c
index 13b3cb1..5f35ab6 100644
--- a/src/input/ipaccess.c
+++ b/src/input/ipaccess.c
@@ -551,8 +551,7 @@ int ipaccess_fd_cb(struct osmo_fd *bfd, unsigned int what)
 	return rc;
 }
 
-static int ipaccess_line_update(struct e1inp_line *line,
-				enum e1inp_line_role role, const char *addr);
+static int ipaccess_line_update(struct e1inp_line *line);
 
 struct e1inp_driver ipaccess_driver = {
 	.name = "ipa",
@@ -778,7 +777,7 @@ static int ipaccess_bts_cb(struct ipa_client_link *link, struct msgb *msg)
 				link->ofd->fd = -1;
 				return -EINVAL;
 			}
-			rmsg = ipa_bts_id_resp(link->line->ops->data,
+			rmsg = ipa_bts_id_resp(link->line->ops->cfg.ipa.dev,
 						data + 1, len - 1);
 			ipaccess_send(link->ofd->fd, rmsg->data, rmsg->len);
 			msgb_free(rmsg);
@@ -814,12 +813,11 @@ static int ipaccess_bts_cb(struct ipa_client_link *link, struct msgb *msg)
 	return 0;
 }
 
-static int ipaccess_line_update(struct e1inp_line *line,
-				enum e1inp_line_role role, const char *addr)
+static int ipaccess_line_update(struct e1inp_line *line)
 {
 	int ret = -ENOENT;
 
-	switch(role) {
+	switch(line->ops->cfg.ipa.role) {
 	case E1INP_LINE_R_BSC: {
 		struct ipa_server_link *oml_link, *rsl_link;
 
@@ -864,7 +862,8 @@ static int ipaccess_line_update(struct e1inp_line *line,
 		link = ipa_client_link_create(tall_ipa_ctx,
 					      &line->ts[E1INP_SIGN_OML-1],
 					      "ipa", E1INP_SIGN_OML,
-					      addr, IPA_TCP_PORT_OML,
+					      line->ops->cfg.ipa.addr,
+					      IPA_TCP_PORT_OML,
 					      NULL,
 					      ipaccess_bts_cb,
 					      ipaccess_bts_write_cb,
@@ -884,7 +883,8 @@ static int ipaccess_line_update(struct e1inp_line *line,
 		rsl_link = ipa_client_link_create(tall_ipa_ctx,
 						  &line->ts[E1INP_SIGN_RSL-1],
 						  "ipa", E1INP_SIGN_RSL,
-						  addr, IPA_TCP_PORT_RSL,
+						  line->ops->cfg.ipa.addr,
+						  IPA_TCP_PORT_RSL,
 						  NULL,
 						  ipaccess_bts_cb,
 						  ipaccess_bts_write_cb,
diff --git a/src/input/misdn.c b/src/input/misdn.c
index 7adcaa6..bb9145f 100644
--- a/src/input/misdn.c
+++ b/src/input/misdn.c
@@ -380,8 +380,7 @@ static int activate_bchan(struct e1inp_line *line, int ts, int act)
 	return ret;
 }
 
-static int mi_e1_line_update(struct e1inp_line *line,
-			     enum e1inp_line_role role, const char *addr);
+static int mi_e1_line_update(struct e1inp_line *line);
 
 struct e1inp_driver misdn_driver = {
 	.name = "misdn",
@@ -479,8 +478,7 @@ static int mi_e1_setup(struct e1inp_line *line, int release_l2)
 	return 0;
 }
 
-static int mi_e1_line_update(struct e1inp_line *line,
-			     enum e1inp_line_role role, const char *addr)
+static int mi_e1_line_update(struct e1inp_line *line)
 {
 	struct mISDN_devinfo devinfo;
 	int sk, ret, cnt;
diff --git a/src/input/rs232.c b/src/input/rs232.c
index eb6b5d0..2fd2a09 100644
--- a/src/input/rs232.c
+++ b/src/input/rs232.c
@@ -277,8 +277,7 @@ rs232_setup(struct e1inp_line *line, const char *serial_port, unsigned int delay
 	return 0;
 }
 
-static int rs232_line_update(struct e1inp_line *line,
-			     enum e1inp_line_role role, const char *addr);
+static int rs232_line_update(struct e1inp_line *line);
 
 static struct e1inp_driver rs232_driver = {
 	.name		= "rs232",
@@ -286,13 +285,13 @@ static struct e1inp_driver rs232_driver = {
 	.line_update	= rs232_line_update,
 };
 
-static int rs232_line_update(struct e1inp_line *line,
-			     enum e1inp_line_role role, const char *addr)
+static int rs232_line_update(struct e1inp_line *line)
 {
 	if (line->driver != &rs232_driver)
 		return -EINVAL;
 
-	return rs232_setup(line, addr, 0);
+	return rs232_setup(line, line->ops->cfg.rs232.port,
+				 line->ops->cfg.rs232.delay);
 }
 
 int e1inp_rs232_init(void)
diff --git a/tests/e1inp_hsl_bsc_test.c b/tests/e1inp_hsl_bsc_test.c
index 292a0e3..a909e02 100644
--- a/tests/e1inp_hsl_bsc_test.c
+++ b/tests/e1inp_hsl_bsc_test.c
@@ -190,8 +190,12 @@ int main(void)
 	osmo_init_logging(&bsc_test_log_info);
 
 	struct e1inp_line_ops ops = {
-		.addr		= "0.0.0.0",
-		.role		= E1INP_LINE_R_BSC,
+		.cfg = {
+			.ipa = {
+				.addr	= "0.0.0.0",
+				.role	= E1INP_LINE_R_BSC,
+			},
+		},
 		.sign_link_up	= sign_link_up,
 		.sign_link_down	= sign_link_down,
 		.sign_link	= sign_link,
diff --git a/tests/e1inp_hsl_bts_test.c b/tests/e1inp_hsl_bts_test.c
index 272eacf..18a06fe 100644
--- a/tests/e1inp_hsl_bts_test.c
+++ b/tests/e1inp_hsl_bts_test.c
@@ -231,9 +231,13 @@ int main(void)
 	osmo_init_logging(&bts_test_log_info);
 
 	struct e1inp_line_ops ops = {
-		.role		= E1INP_LINE_R_BTS,
-		.addr		= "127.0.0.1",
-		.data		= &bts_dev_info,
+		.cfg = {
+			.ipa = {
+				.role	= E1INP_LINE_R_BTS,
+				.addr	= "127.0.0.1",
+				.dev	= &bts_dev_info,
+			},
+		},
 		.sign_link_up	= sign_link_up,
 		.sign_link_down	= sign_link_down,
 		.sign_link	= sign_link,
diff --git a/tests/e1inp_ipa_bsc_test.c b/tests/e1inp_ipa_bsc_test.c
index ba3aabb..424c87b 100644
--- a/tests/e1inp_ipa_bsc_test.c
+++ b/tests/e1inp_ipa_bsc_test.c
@@ -205,8 +205,12 @@ int main(void)
 	osmo_init_logging(&bsc_test_log_info);
 
 	struct e1inp_line_ops ops = {
-		.addr		= "0.0.0.0",
-		.role		= E1INP_LINE_R_BSC,
+		.cfg = {
+			.ipa = {
+				.addr	= "0.0.0.0",
+				.role	= E1INP_LINE_R_BSC,
+			},
+		},
 		.sign_link_up	= sign_link_up,
 		.sign_link_down	= sign_link_down,
 		.sign_link	= sign_link,
diff --git a/tests/e1inp_ipa_bts_test.c b/tests/e1inp_ipa_bts_test.c
index 2c03d94..3549661 100644
--- a/tests/e1inp_ipa_bts_test.c
+++ b/tests/e1inp_ipa_bts_test.c
@@ -252,9 +252,13 @@ int main(void)
 	osmo_init_logging(&bts_test_log_info);
 
 	struct e1inp_line_ops ops = {
-		.role		= E1INP_LINE_R_BTS,
-		.addr		= "127.0.0.1",
-		.data		= &bts_dev_info,
+		.cfg = {
+			.ipa = {
+				.role	= E1INP_LINE_R_BTS,
+				.addr	= "127.0.0.1",
+				.dev	= &bts_dev_info,
+			},
+		},
 		.sign_link_up	= sign_link_up,
 		.sign_link_down	= sign_link_down,
 		.sign_link	= sign_link,