[PATCH] voicecall.c: use swap_without_accept method, if present

[PATCH] voicecall.c: use swap_without_accept method, if present

[Pekka Pessi]

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From: Pekka Pessi <Pekka.Pessi@nokia.com>

---
 src/voicecall.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/src/voicecall.c b/src/voicecall.c
index eff6321..1be907a 100644
--- a/src/voicecall.c
+++ b/src/voicecall.c
@@ -835,11 +835,31 @@ static DBusMessage *manager_transfer(DBusConnection *conn,
 	return NULL;
 }
 
+static DBusMessage *manager_swap_without_accept(DBusConnection *conn,
+						DBusMessage *msg, void *data)
+{
+	struct ofono_voicecall *vc = data;
+
+	if (vc->flags & VOICECALLS_FLAG_PENDING)
+		return __ofono_error_busy(msg);
+
+	vc->flags |= VOICECALLS_FLAG_PENDING;
+	vc->pending = dbus_message_ref(msg);
+
+	vc->driver->swap_without_accept(vc, generic_callback, vc);
+
+	return NULL;
+}
+
+
 static DBusMessage *manager_swap_calls(DBusConnection *conn,
 					DBusMessage *msg, void *data)
 {
 	struct ofono_voicecall *vc = data;
 
+	if (vc->driver->swap_without_accept)
+		return manager_swap_without_accept(conn, msg, data);
+
 	if (vc->flags & VOICECALLS_FLAG_PENDING)
 		return __ofono_error_busy(msg);
 
-- 
1.6.0.4

[PATCH] voicecall: allow sending DTMF tones while call is in alerting state

[Pekka Pessi]

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From: Pekka Pessi <Pekka.Pessi@nokia.com>

2nd stage dialing may be done before call gets connected.
---
 src/voicecall.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/src/voicecall.c b/src/voicecall.c
index 1be907a..bd5358c 100644
--- a/src/voicecall.c
+++ b/src/voicecall.c
@@ -138,7 +138,7 @@ static const char *call_status_to_string(int status)
 	case CALL_STATUS_DIALING:
 		return "dialing";
 	case CALL_STATUS_ALERTING:
-	return "alerting";
+		return "alerting";
 	case CALL_STATUS_INCOMING:
 		return "incoming";
 	case CALL_STATUS_WAITING:
@@ -561,6 +561,10 @@ static gboolean voicecalls_have_connected(struct ofono_voicecall *vc)
 
 		if (v->call->status == CALL_STATUS_ACTIVE)
 			return TRUE;
+
+		/* Connected for 2nd stage dialing */
+		if (v->call->status == CALL_STATUS_ALERTING)
+			return TRUE;
 	}
 
 	return FALSE;
-- 
1.6.0.4

[PATCH] voicecall: allow P or , within the dial string

[Pekka Pessi]

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From: Pekka Pessi <Pekka.Pessi@nokia.com>

"DTMF control digit separator" is used as pause according to GSM 02.07.
According to GSM 11.11 it is stored as BCD code 1100 in the SIM card. Nokia
modems use 'p' to represent pause. AT commands use ',' to represent pause.

Note that the interpretation of 'p' and ',' differs when used as a part of a
dial strings. When a dial string is separated from the phone number by ',',
sending the dial string starts after call is alerting. When a dial string is
separated by 'p' (DTMF control digit separator), dial string is sent only
after call is connected.
---
 src/voicecall.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/src/voicecall.c b/src/voicecall.c
index bd5358c..c69c822 100644
--- a/src/voicecall.c
+++ b/src/voicecall.c
@@ -1121,6 +1121,12 @@ static DBusMessage *manager_tone(DBusConnection *conn,
 				(tones[i] >= 'A' && tones[i] <= 'D'))
 			continue;
 
+		/* Pause can be described with P or , */
+		if (tones[i] == 'P' || tones[i] == ',') {
+			tones[i] = 'p';
+			continue;
+		}
+
 		g_free(tones);
 		return __ofono_error_invalid_format(msg);
 	}
-- 
1.6.0.4

Re: [PATCH] voicecall: allow P or , within the dial string

[Denis Kenzior]

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Hi Pekka,

> "DTMF control digit separator" is used as pause according to GSM 02.07.
> According to GSM 11.11 it is stored as BCD code 1100 in the SIM card. Nokia
> modems use 'p' to represent pause. AT commands use ',' to represent pause.

Strictly speaking AT modems use 'C' to represent the pause.  Can you point me 
to any spec that actually says ',' and 'p' are used the way you describe?

> +		/* Pause can be described with P or , */
> +		if (tones[i] == 'P' || tones[i] == ',') {
> +			tones[i] = 'p';

This should really be 'C'.

We also need to modify the code above not to accept 'D' as a valid character 
since that is a wild card value.

Regards,
-Denis

Re: [PATCH] voicecall: allow P or , within the dial string

[Pekka Pessi]

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2009/10/8 Denis Kenzior <denkenz@gmail.com>:
>> "DTMF control digit separator" is used as pause according to GSM 02.07.
>> According to GSM 11.11 it is stored as BCD code 1100 in the SIM card. Nokia
>> modems use 'p' to represent pause. AT commands use ',' to represent pause.
>
> Strictly speaking AT modems use 'C' to represent the pause.  Can you point me
> to any spec that actually says ',' and 'p' are used the way you describe?

C?

RFC 4967 uses 'X' to wait for call completion, and 'P' for pause.

Nokia modems use 'p' to represent DMTF control digit separator. GSM
02.07 specifies how the DTMF control digit separator is used when
making calls. The dtmf digits in the dial string are sent after the
call gets connected. The extra separator characters represent extra
delays.

V.250 uses '@' to wait for call completion, and ',' for pause
(controlled by S8).

>> +             /* Pause can be described with P or , */
>> +             if (tones[i] == 'P' || tones[i] == ',') {
>> +                     tones[i] = 'p';
>
> This should really be 'C'.
>
> We also need to modify the code above not to accept 'D' as a valid character
> since that is a wild card value.

The dial string stored  in the SIM card along with a phone number
cannot contain DTMF digits A-D. However, the other dialstrings do not
share the same limitation and they can can contain full set of DTMF
digits, 0-9, *, #, A, B, C, and D. The special bcd coded digits (dtmf
control digit separator and wildcard) from the SIM card must be mapped
outside this set.

Nokia modems use 'p' and '?' for that purpose (extended bcd code
0b1100 => 'p', extended bcd code 0b1101 => '?').  I think G1 uses ','
instead of 'p'. Either one is fine.

An why to include pause in the tones string in the first place? The
current API does not provide any feedback of the sent dtmf digits to
the application or between ofono driver and core, so the only way to
implement pauses between digits is to include them in the dial string
and hope the driver can do something about them.

-- 
Pekka.Pessi mail at nokia.com

Re: [PATCH] voicecall: allow P or , within the dial string

[Denis Kenzior]

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Hi Pekka,

> 2009/10/8 Denis Kenzior <denkenz@gmail.com>:
> >> "DTMF control digit separator" is used as pause according to GSM 02.07.
> >> According to GSM 11.11 it is stored as BCD code 1100 in the SIM card.
> >> Nokia modems use 'p' to represent pause. AT commands use ',' to
> >> represent pause.
> >
> > Strictly speaking AT modems use 'C' to represent the pause.  Can you
> > point me to any spec that actually says ',' and 'p' are used the way you
> > describe?
>
> C?

Unless I'm missing something, the DTMF 'C' digit refers exactly to what you're 
trying to achieve with 'p' and ','

Check TS 11.11 Table 12.  'C' is mentioned as the DTMF Control digit separator 
from TS 02.07.

Also, quoting 27.007 for valid input to VTS:  "A single ASCII character in the 
set 0 9, #,*,A D. This is interpreted as a single ACSII character whose 
duration is set by the +VTD command."

It sounds like 'p' is entirely an MMI convention, not anything defined by a 
standard...

>
> RFC 4967 uses 'X' to wait for call completion, and 'P' for pause.
>

oFono does not (yet) care about SIP.

> Nokia modems use 'p' to represent DMTF control digit separator. GSM
> 02.07 specifies how the DTMF control digit separator is used when
> making calls. The dtmf digits in the dial string are sent after the
> call gets connected. The extra separator characters represent extra
> delays.

Yes, however 02.07 never mentions 'p' or ','.  Quoting: "The way in which the 
separator is entered and display in the ME, is left to the individual 
manufacturer's MMI."

Since 'C' is defined by the standard, that is what oFono core should use.  If 
Nokia modems prefer 'p' over C, simply convert these in the specific driver.

> The dial string stored  in the SIM card along with a phone number
> cannot contain DTMF digits A-D. However, the other dialstrings do not
> share the same limitation and they can can contain full set of DTMF
> digits, 0-9, *, #, A, B, C, and D. The special bcd coded digits (dtmf
> control digit separator and wildcard) from the SIM card must be mapped
> outside this set.

SIM storage is a nightmare.  The problem is that on the SIM the following 
characters are valid: 0-9, 'A', 'B', 'C', 'D'.  'F' is used as an endmark 
(e.g. empty) character.  'E' has been deprecated and not used for anything.  
Much of the confusion stems from the fact that 'A' maps to '*' and 'B' maps to 
'#'.  Whenever you store anything on the SIM, you have to convert '*' and '#' 
back to 'A' and 'B'.  oFono does this for you when writing to / from the SIM.

The EFadn, EFsdn, etc can definitely contain the full set above for the SSC / 
Dialing Number fields.  However, the 'C' and 'D' characters cannot actually be 
sent to the network.

In fact 'D' is particularly evil since it requires special handling in the UI.  
Hence 'D' should be stripped from the valid DTMF set that oFono supports.

'C' is used as a separator in its first occurrence, but also as a pause 
character for all subsequent occurrences.

>
> Nokia modems use 'p' and '?' for that purpose (extended bcd code
> 0b1100 => 'p', extended bcd code 0b1101 => '?').  I think G1 uses ','
> instead of 'p'. Either one is fine.

Yes, you're talking about the 'C' (1100) and 'D' (1101') DTMF characters, as 
above.  I have no problem handling 'P', 'p', ',' and 'X' or whatever at the D-
Bus API level.  However, what gets sent down to the modem must be according to 
some standard.  Doing otherwise leads to chaos.

> An why to include pause in the tones string in the first place? The
> current API does not provide any feedback of the sent dtmf digits to
> the application or between ofono driver and core, so the only way to
> implement pauses between digits is to include them in the dial string
> and hope the driver can do something about them.

I still wonder about this myself.  Strictly speaking all modems should support 
the 'C' digit.  In the worst case the modem driver can simulate a 3 second 
delay itself.  Whether this should be encouraged or not is questionable.

'D' should be never sent to oFono in the first place, it is entirely an MMI 
issue.

However, I agree that the current situation is less than ideal.  Ideas / 
suggestions welcome.

Regards,
-Denis

Re: [PATCH] voicecall: allow P or , within the dial string

[Pekka Pessi]

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Hi Denis,

>> >> "DTMF control digit separator" is used as pause according to GSM 02.07.
>> >> According to GSM 11.11 it is stored as BCD code 1100 in the SIM card.
>> >> Nokia modems use 'p' to represent pause. AT commands use ',' to
>> >> represent pause.
>> >
>> > Strictly speaking AT modems use 'C' to represent the pause.  Can you
>> > point me to any spec that actually says ',' and 'p' are used the way you
>> > describe?
>>
>> C?
>
> Unless I'm missing something, the DTMF 'C' digit refers exactly to what you're
> trying to achieve with 'p' and ','
>
> Check TS 11.11 Table 12.  'C' is mentioned as the DTMF Control digit separator
> from TS 02.07.

You mean binary code 0b1100 aka hex code 0xC? It would be otherwise
known as DTMF digit 'A'. Welcome to wonderful world of phones.

Have a peek in src/smsutil.c to_semi_octet().

> Also, quoting 27.007 for valid input to VTS:  "A single ASCII character in the
> set 0 9, #,*,A D. This is interpreted as a single ACSII character whose
> duration is set by the +VTD command."

Yep. Those are actual tones sent within media, however. There are 16
different DTMF tones, 0-9, *, # A, B, C and D have each different
tone. If you say at+vts="A" while call is going on, other end hears a
tone. If you say at+vts="C", different tone is heard.

GSM 11.11 cheated and used the DTMF digits from A to D for other
purpose: 'A' (0b1100, 0xC) for the separating dial string from the
phone number, 'B' for FDN wildcard, 'C' for quoting, and 'D' for
padding.

> It sounds like 'p' is entirely an MMI convention, not anything defined by a
> standard...

Exactly.

>> RFC 4967 uses 'X' to wait for call completion, and 'P' for pause.
>
> oFono does not (yet) care about SIP.

But we care about dial strings, right?

>> Nokia modems use 'p' and '?' for that purpose (extended bcd code
>> 0b1100 => 'p', extended bcd code 0b1101 => '?').  I think G1 uses ','
>> instead of 'p'. Either one is fine.

> Yes, you're talking about the 'C' (1100) and 'D' (1101') DTMF characters, as
> above.  I have no problem handling 'P', 'p', ',' and 'X' or whatever at the D-
> Bus API level.

Cool.

>However, what gets sent down to the modem must be according to
> some standard.  Doing otherwise leads to chaos.

There is no standard. We should specify one.

>> An why to include pause in the tones string in the first place? The
>> current API does not provide any feedback of the sent dtmf digits to
>> the application or between ofono driver and core, so the only way to
>> implement pauses between digits is to include them in the dial string
>> and hope the driver can do something about them.
>
> I still wonder about this myself.  Strictly speaking all modems should support
> the 'C' digit.  In the worst case the modem driver can simulate a 3 second
> delay itself.  Whether this should be encouraged or not is questionable.

I'm afraid the modem driver has to implement pause either by itself or
with some modem-specific command.

Each DTMF digit is sent using 24.008/Q.931 "Start DTMF" message,
followed by "Stop DTMF". Start DTMF contains DTMF digit encoded as a
single IRA character (from the set of 0-9, *, # and A-D). If there is
pause (like one defined in 02.07), modem just don't send next "Start
DTMF" for 3 seconds.

AT+VTS tries to hide that, you just give digit and its duration.

Any layer above modem driver has no control on duration of dtmf
digits, nor any idea when the pause gets started and when next digit
should be sent.

...
> However, I agree that the current situation is less than ideal.  Ideas /
> suggestions welcome.

I'd propose that we allow dial strings in phone numbers, like,

"8188080p1234#pp6789#" (Nokia)
"8188080(a)1234#,,6789#" (V.250)

Both strings mean same, after call gets connected, there is 3 second
pause, then digits 1234# are sent, again 6 second pause, and digits
6789# are sent.

Both will be stored on SIM phonebook in same format. When phone number
is read from SIM card, Ofono modem driver should return it in V.250
format.

Ofono should also accept dial strings like

"8188080,1234#,6789#ABCD#"

where the , means that voicecall should start sending DTMF digits 3
seconds after first RINGING.

If a string starting with 'p' or '@' is given to SendTones() before
call is connected, driver waits until call is connected before sending
it to network. If call is already connected, ',', 'p' or '@' are
interpreted as pause of 3 seconds.

-- 
Pekka.Pessi mail at nokia.com

Re: [PATCH] voicecall: allow P or , within the dial string

[Denis Kenzior]

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Hi Pekka,

> > Unless I'm missing something, the DTMF 'C' digit refers exactly to what
> > you're trying to achieve with 'p' and ','
> >
> > Check TS 11.11 Table 12.  'C' is mentioned as the DTMF Control digit
> > separator from TS 02.07.
>
> You mean binary code 0b1100 aka hex code 0xC? It would be otherwise
> known as DTMF digit 'A'. Welcome to wonderful world of phones.
>
> Have a peek in src/smsutil.c to_semi_octet().
>

Funny part is that I wrote that function :)  But actually you're absolutely 
correct.  I forgot how context sensitive this specification is.  Just so we're 
on the same page:

24.008 Table 10.5.118 maps BCD thus:
0-9, 10 -> '*', 11 -> '#', 12-> 'a', 13-> 'b', 14->'c', 15 -> endmark

TS 11.11, 51.011 and 31.102 define the BCD SIM storage thus:
0-9, 10-> '*', 11->'#', 12->'C' DTMF Control Digit separator, 13 -> 'D' Wild 
value. 14 -> RFU, 15->Endmark.

DTMF digits have yet another coding.  The current implementation is actually 
correct,  so you can safely ignore most of what I said in the last message.

> I'm afraid the modem driver has to implement pause either by itself or
> with some modem-specific command.
>
> Each DTMF digit is sent using 24.008/Q.931 "Start DTMF" message,
> followed by "Stop DTMF". Start DTMF contains DTMF digit encoded as a
> single IRA character (from the set of 0-9, *, # and A-D). If there is
> pause (like one defined in 02.07), modem just don't send next "Start
> DTMF" for 3 seconds.
>
> AT+VTS tries to hide that, you just give digit and its duration.

Problem is, AT+VTS only handles true DTMF characters according to 27.007.  Any 
pauses have to be simulated or sent directly using ATD.  If we are going to 
support such dialstrings, we have to do this in the core daemon, not the 
driver.

> I'd propose that we allow dial strings in phone numbers, like,
>
> "8188080p1234#pp6789#" (Nokia)
> "8188080(a)1234#,,6789#" (V.250)

Yuck.  Lets come up with one format to support, if possible.  How does CDMA 
handle this nonsense?

>
> Ofono should also accept dial strings like
>
> "8188080,1234#,6789#ABCD#"
>
> where the , means that voicecall should start sending DTMF digits 3
> seconds after first RINGING.

A significant number of modems do not return from ATD until the call is 
connected, not just ringing.  So unless we use a different multiplexer channel 
for DTMF such behavior cannot be guaranteed.  Even with a multiplexer this 
probably won't work with a significant number of modems.

>
> If a string starting with 'p' or '@' is given to SendTones() before
> call is connected, driver waits until call is connected before sending
> it to network. If call is already connected, ',', 'p' or '@' are
> interpreted as pause of 3 seconds.

Yuck.  I suggest we leave SendTones as is.  If we support this behavior it 
should be specified by the dialing number.

The biggest issue is that there is no progress synchronization as you've 
already mentioned.   Most of the modern platforms need to generate audible 
events whenever a DTMF is signaled since this is (potentially) no longer 
handled by the modem.   The current API was actually intended to be used only 
as a 'slave' by a controlling entity that interacts with UI, audio framework 
and oFono.

While I'm sure we can accommodate a state machine to handle all of this 
nonsense inside oFono, I'm no longer convinced we should.

First step should be to come up with a nice, clean API for all of this that 
will report DTMF progress, and has a realistic chance of actually being 
implemented across modems and technologies.

Regards,
-Denis

Re: [PATCH] voicecall: allow sending DTMF tones while call is in alerting state

[Denis Kenzior]

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Hi Pekka,

Patch has been applied.  Thanks.

Regards,
-Denis

Re: [PATCH] voicecall.c: use swap_without_accept method, if present

[Denis Kenzior]

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Hi Pekka,

I modified the commit message slightly and applied the patch.  Thanks!

Regards,
-Denis