diff --git a/TODO-RELEASE b/TODO-RELEASE
index 5f2f654..99d9735 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -9,3 +9,4 @@
 #library	what		description / commit summary line
 libosmo-abis	struct e1inp_driver Field added at the end (ABI break)
 libosmocodec	>1.8.0		osmo_{fr,efr}_sid_classify() new functions
+libosmo-abis	struct e1inp_driver Field added (line_create callback) at the end (ABI break)
diff --git a/include/osmocom/abis/e1_input.h b/include/osmocom/abis/e1_input.h
index a66f8eb..b40382e 100644
--- a/include/osmocom/abis/e1_input.h
+++ b/include/osmocom/abis/e1_input.h
@@ -190,6 +190,9 @@ struct e1inp_driver {
 
 	/* Set Sa bits to transmit in TS0 (MSB to LSB): Sa8 Sa7 Sa5 Sa4 Sa64 Sa63 Sa62 Sa61/Sa6 */
 	int (*set_sa_bits)(struct e1inp_line *line, uint8_t sa_bits);
+
+	/* Optional callback to perform driver specific initialization when the line is created. */
+	int (*line_create)(struct e1inp_line *line);
 };
 
 struct e1inp_line_ops {
diff --git a/src/e1_input.c b/src/e1_input.c
index e3ac67e..6fca307 100644
--- a/src/e1_input.c
+++ b/src/e1_input.c
@@ -639,8 +639,16 @@ e1inp_line_create(uint8_t e1_nr, const char *driver_name)
 
 	line->use_count.talloc_object = line;
 	line->use_count.use_cb = e1inp_line_use_cb;
-	e1inp_line_get2(line, "ctor");
 
+	if (driver->line_create) {
+		if (driver->line_create(line) < 0) {
+			LOGPIL(line, DLINP, LOGL_ERROR, "Cannot initialize line driver\n");
+			talloc_free(line);
+			return NULL;
+		}
+	}
+
+	e1inp_line_get2(line, "ctor");
 	llist_add_tail(&line->list, &e1inp_line_list);
 
 	return line;