From a04f6e025ff2b440dcca23d5909ef17d81da6941 Mon Sep 17 00:00:00 2001
From: Andreas Eversberg <jolly@eversberg.eu>
Date: Sun, 31 Mar 2013 12:52:04 +0200
Subject: [PATCH] Add essential option to enable and prefer half rate calls to
 mobile

Without it might not be possible to use TCH/H, unless OpenBSC would
support late assignment.
---
 default/interface.conf |  1 +
 gsm_bs.cpp             | 15 +++++++++++++++
 interface.c            | 13 +++++++++++++
 interface.h            |  1 +
 4 files changed, 30 insertions(+)

diff --git a/default/interface.conf b/default/interface.conf
index 698e98c..19c7a34 100644
--- a/default/interface.conf
+++ b/default/interface.conf
@@ -162,6 +162,7 @@
 # The MSN numbers will equal the subscriber number.
 #[GSM]
 #gsm-bs
+#hr
 #tones yes
 #earlyb no
 
diff --git a/gsm_bs.cpp b/gsm_bs.cpp
index e9b6be8..97be942 100644
--- a/gsm_bs.cpp
+++ b/gsm_bs.cpp
@@ -807,6 +807,13 @@ void Pgsm_bs::message_setup(unsigned int epoint_id, int message_id, union parame
 	struct lcr_msg *message;
 	struct epoint_list *epointlist;
 	struct gsm_mncc *mncc;
+	struct interface *interface;
+
+	interface = getinterfacebyname(p_interface_name);
+	if (!interface) {
+		PERROR("Cannot find interface %s.\n", p_interface_name);
+		return;
+	}
 
 	/* copy setup infos to port */
 	memcpy(&p_callerinfo, &param->setup.callerinfo, sizeof(p_callerinfo));
@@ -1010,6 +1017,14 @@ void Pgsm_bs::message_setup(unsigned int epoint_id, int message_id, union parame
 		add_trace("redir", "number", "%s", mncc->redirecting.number);
 	}
 
+	if (interface->gsm_bs_hr) {
+		add_trace("lchan", "type", "TCH/H or TCH/F");
+		mncc->lchan_type = GSM_LCHAN_TCH_H;
+	} else {
+		add_trace("lchan", "type", "TCH/F");
+		mncc->lchan_type = GSM_LCHAN_TCH_F;
+	}
+
 	end_trace();
 	send_and_free_mncc(p_g_lcr_gsm, mncc->msg_type, mncc);
 
diff --git a/interface.c b/interface.c
index 33f0c10..d66bbe8 100644
--- a/interface.c
+++ b/interface.c
@@ -922,6 +922,17 @@ static int inter_gsm_bs(struct interface *interface, char *filename, int line, c
 	return(0);
 #endif
 }
+static int inter_gsm_bs_hr(struct interface *interface, char *filename, int line, char *parameter, char *value)
+{
+#ifndef WITH_GSM_BS
+	SPRINT(interface_error, "Error in %s (line %d): GSM BS side not compiled in.\n", filename, line);
+	return(-1);
+#else
+	interface->gsm_bs_hr = 1;
+
+	return(0);
+#endif
+}
 static int inter_gsm_ms(struct interface *interface, char *filename, int line, char *parameter, char *value)
 {
 #ifndef WITH_GSM_MS
@@ -1331,6 +1342,8 @@ struct interface_param interface_param[] = {
 	""},
 	{"gsm-bs", &inter_gsm_bs, "",
 	"Sets up GSM base station interface for using OpenBSC."},
+	{"hr", &inter_gsm_bs_hr, "",
+	"Enable and prefer half rate for mobile terminating calls."},
 	{"gsm-ms", &inter_gsm_ms, "<socket>",
 	"Sets up GSM mobile station interface for using Osmocom-BB.\n"
 	"The name of the MS folows the interface name.\n"
diff --git a/interface.h b/interface.h
index 1f9b4b0..a4b4baa 100644
--- a/interface.h
+++ b/interface.h
@@ -113,6 +113,7 @@ struct interface {
 	char			remote_context[128]; /* context feld to use for remote application */
 #ifdef WITH_GSM_BS
 	int			gsm_bs; /* interface is an GSM BS interface */
+	int			gsm_bs_hr; /* prefer half rate for MOT calls */
 #if 0
 	int			gsm_bs_payloads;
 	unsigned char		gsm_bs_payload_types[8];
-- 
2.13.6