diff --git a/src/gsm.c b/src/gsm.c
index 61679cd..85b2ac1 100644
--- a/src/gsm.c
+++ b/src/gsm.c
@@ -348,6 +348,14 @@ void gsm_set_callback(GSM * gsm, GSMCallback callback, gpointer data)
 }
 
 
+/* gsm_set_call_presentation */
+int gsm_set_call_presentation(GSM * gsm, int set)
+{
+	return gsm_modem_set_call_presentation(gsm->modem, (set != 0) ? TRUE
+			: FALSE);
+}
+
+
 /* gsm_set_extended_errors */
 int gsm_set_extended_errors(GSM * gsm, int extended)
 {
@@ -371,6 +379,14 @@ int gsm_set_functional(GSM * gsm, int functional)
 }
 
 
+/* gsm_set_line_presentation */
+int gsm_set_line_presentation(GSM * gsm, int set)
+{
+	return gsm_modem_set_line_presentation(gsm->modem, (set != 0) ? TRUE
+			: FALSE);
+}
+
+
 /* gsm_set_operator_format */
 int gsm_set_operator_format(GSM * gsm, GSMOperatorFormat format)
 {
diff --git a/src/gsm.h b/src/gsm.h
index 7bc6cd3..5abad02 100644
--- a/src/gsm.h
+++ b/src/gsm.h
@@ -266,8 +266,10 @@ void gsm_delete(GSM * gsm);
 void gsm_set_callback(GSM * gsm, GSMCallback callback, gpointer data);
 
 unsigned int gsm_get_retry(GSM * gsm);
+int gsm_set_call_presentation(GSM * gsm, int set);
 int gsm_set_extended_ring_reports(GSM * gsm, int extended);
 int gsm_set_functional(GSM * gsm, int functional);
+int gsm_set_line_presentation(GSM * gsm, int set);
 int gsm_set_operator_format(GSM * gsm, GSMOperatorFormat format);
 int gsm_set_operator_mode(GSM * gsm, GSMOperatorMode mode);
 int gsm_set_registration_report(GSM * gsm, GSMRegistrationReport report);
diff --git a/src/modem.c b/src/modem.c
index 586827a..a6e236c 100644
--- a/src/modem.c
+++ b/src/modem.c
@@ -540,6 +540,16 @@ int gsm_modem_set_extended_ring_reports(GSMModem * gsmm, gboolean extended)
 }
 
 
+/* gsm_modem_set_line_presentation */
+int gsm_modem_set_line_presentation(GSMModem * gsmm, gboolean set)
+{
+	char cmd[] = "AT+COLP=X";
+
+	cmd[8] = set ? '1' : '0';
+	return (gsm_queue(gsmm->gsm, cmd) != NULL) ? 0 : 1;
+}
+
+
 /* gsm_modem_set_functional */
 static void _modem_set_functional_callback(GSM * gsm);
 
diff --git a/src/modem.h b/src/modem.h
index aa90f74..104af90 100644
--- a/src/modem.h
+++ b/src/modem.h
@@ -76,6 +76,7 @@ int gsm_modem_set_call_presentation(GSMModem * gsmm, gboolean set);
 int gsm_modem_set_echo(GSMModem * gsmm, gboolean echo);
 int gsm_modem_set_extended_errors(GSMModem * gsmm, gboolean extended);
 int gsm_modem_set_extended_ring_reports(GSMModem * gsmm, gboolean extended);
+int gsm_modem_set_line_presentation(GSMModem * gsmm, gboolean set);
 int gsm_modem_set_functional(GSMModem * gsmm, gboolean functional);
 int gsm_modem_set_message_format(GSMModem * gsmm, GSMMessageFormat format);
 int gsm_modem_set_operator_format(GSMModem * gsmm, GSMOperatorFormat format);