manawyrm has uploaded this change for review.
gsm48_ie.c: force rate adaptation mode for CSD calls to V.110
Certain calls (seen on very old Nokias) won't have the rate adaptation flag
set on "analog" CSD calls. The field for the intermediate rate (after RA) is
still filled correctly.
Workaround this by setting the RA to V.110 whenever the RA is unset but an
intermediate rate is specified.
Change-Id: I260834f3d28034afa6b50a6ca8c89accba8fa65b
---
M src/gsm/gsm48_ie.c
1 file changed, 22 insertions(+), 0 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/45/34745/1
diff --git a/src/gsm/gsm48_ie.c b/src/gsm/gsm48_ie.c
index 7de1f98..749452f 100644
--- a/src/gsm/gsm48_ie.c
+++ b/src/gsm/gsm48_ie.c
@@ -281,6 +281,13 @@
bcap->data.parity = lv[i] & 7;
bcap->data.interm_rate = (lv[i] >> 5) & 3;
+ // 3.1kHz CSD calls won't have the rate adaptation field set
+ // but do require rate adaptation.
+ if (bcap->data.interm_rate && !bcap->data.rate_adaption)
+ {
+ bcap->data.rate_adaption = GSM48_BCAP_RA_V110_X30;
+ }
+
/* octet 6c */
if (!(lv[i] & 0x80)) {
i++;
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