[PATCH 2/3] bsc/ussd: Send faked CM Service Accept before sending USSD

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Jacob Erlbeck jerlbeck at sysmocom.de
Thu Oct 31 14:36:42 UTC 2013


The MS do not show the USSD messages yet. This patch modifies the
implementation to insert a CM Service Accept to finish the
establishment of the MM connection according to 3GPP TS 04.10/3.2.1
before the USSD notification is sent.

This fix has been tested with a Blackberry phone that has shown
an ussd_grace_txt after rf_locked has been set to '1'. Without this
patch, that message wasn't shown. The phone has sent a CC Setup
and other messages before processing the channel release message sent
by the BSC, but these messages have not been forwarded to the MSC (as
expected).

Ticket: OW#957
Sponsored-by: On-Waves ehf
---
 openbsc/src/osmo-bsc/osmo_bsc_api.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/openbsc/src/osmo-bsc/osmo_bsc_api.c b/openbsc/src/osmo-bsc/osmo_bsc_api.c
index 675bbb2..eca2535 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_api.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_api.c
@@ -123,6 +123,9 @@ static void bsc_send_ussd_notification(struct gsm_subscriber_connection *conn,
 		return;
 	}
 
+	LOGP(DMSC, LOGL_INFO, "Sending CM Service Accept\n");
+	gsm48_tx_mm_serv_ack(conn);
+
 	LOGP(DMSC, LOGL_INFO, "Sending USSD message: '%s'\n", text);
 	gsm0480_send_ussdNotify(conn, 1, text);
 	gsm0480_send_releaseComplete(conn);
-- 
1.7.9.5





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