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bsc/ussd: Send faked CM Service Accept before sending USSD 

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
This commit is contained in:
Jacob Erlbeck 2013-10-31 15:36:42 +01:00 committed by Holger Hans Peter Freyther
parent 24d3b91d46
commit b1250312ba
1 changed files with 3 additions and 0 deletions
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3
openbsc/src/osmo-bsc/osmo_bsc_api.c
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@ -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);