Change in osmo-msc[master]: libmsc/gsm_04_11.c: clarify implicit CP-ACK handling

[Vadim Yanitskiy]

Vadim Yanitskiy has uploaded this change for review. ( https://gerrit.osmocom.org/13633


Change subject: libmsc/gsm_04_11.c: clarify implicit CP-ACK handling
......................................................................

libmsc/gsm_04_11.c: clarify implicit CP-ACK handling

Change-Id: I3c5327a5019590c65d0ccb33a52f07b3988ea952
---
M src/libmsc/gsm_04_11.c
1 file changed, 6 insertions(+), 4 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-msc refs/changes/33/13633/1

diff --git a/src/libmsc/gsm_04_11.c b/src/libmsc/gsm_04_11.c
index 434f878..da0744a 100644
--- a/src/libmsc/gsm_04_11.c
+++ b/src/libmsc/gsm_04_11.c
@@ -1238,11 +1238,13 @@
 	LOG_TRANS(trans, LOGL_DEBUG, "receiving SMS message %s\n",
 		  gsm48_pdisc_msgtype_name(gsm48_hdr_pdisc(gh), gsm48_hdr_msg_type(gh)));
 
-	/* 5.4: For MO, if a CP-DATA is received for a new
-	 * transaction, equals reception of an implicit
-	 * last CP-ACK for previous transaction */
+	/* According to section 5.3.4, due to structure of message flow on
+	 * SAPI 0 and 3 it is possible that the CP-ACK of a short message
+	 * transfer might not be received. In this case the reception of
+	 * CP-DATA may be interpreted as the reception of the awaited
+	 * CP-ACK (implicit) and CP-DATA message. */
 	if (trans->sms.smc_inst.cp_state == GSM411_CPS_IDLE
-	 && msg_type == GSM411_MT_CP_DATA) {
+	    && msg_type == GSM411_MT_CP_DATA) {
 		int i;
 		struct gsm_trans *ptrans;
 

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Gerrit-Project: osmo-msc
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I3c5327a5019590c65d0ccb33a52f07b3988ea952
Gerrit-Change-Number: 13633
Gerrit-PatchSet: 1
Gerrit-Owner: Vadim Yanitskiy <axilirator at gmail.com>
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