From: Jarkko Lehtoranta <devel(a)jlranta.com&gt; Voice output serial port is enabled on some Huawei models (e.g. E169) without problems, but for example on E173u-2 it is never enabled during an incoming call. There might also be other Huawei models having the same issue. I traced the issue down to "^DDSETEX" AT command, which is used to notify the device to start streaming audio. It seems that Ofono sends this command too early on incoming calls. The command should always be sent *after* the dial "D" or answer "A" command. The patch fixes this behavior and afterwards voice will also work on E173u-2. Signed-off-by: Jarkko Lehtoranta <devel(a)jlranta.com&gt; --- drivers/huaweimodem/voicecall.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/huaweimodem/voicecall.c b/drivers/huaweimodem/voicecall.c index 1ea2613..3952b95 100644 --- a/drivers/huaweimodem/voicecall.c +++ b/drivers/huaweimodem/voicecall.c @@ -78,9 +78,6 @@ static struct ofono_call *create_call(struct ofono_voicecall *vc, int type, d->calls = g_slist_insert_sorted(d->calls, call, at_util_call_compare); - g_at_chat_send(d->chat, "AT^DDSETEX=2", none_prefix, - NULL, NULL, NULL); - return call; } @@ -117,6 +114,7 @@ static void huawei_dial(struct ofono_voicecall *vc, ofono_voicecall_cb_t cb, void *data) { char buf[256]; + struct voicecall_data *vd = ofono_voicecall_get_data(vc); if (ph->type == 145) snprintf(buf, sizeof(buf), "ATD+%s", ph->number); @@ -137,12 +135,20 @@ static void huawei_dial(struct ofono_voicecall *vc, strcat(buf, ";"); huawei_template(vc, buf, cb, data); + + g_at_chat_send(vd->chat, "AT^DDSETEX=2", none_prefix, + NULL, NULL, NULL); } static void huawei_answer(struct ofono_voicecall *vc, ofono_voicecall_cb_t cb, void *data) { + struct voicecall_data *vd = ofono_voicecall_get_data(vc); + huawei_template(vc, "ATA", cb, data); + + g_at_chat_send(vd->chat, "AT^DDSETEX=2", none_prefix, + NULL, NULL, NULL); } static void huawei_hangup(struct ofono_voicecall *vc, -- 1.7.9.3