DTMF on SIP External Gateway

[toro_dlp]

Scenery:
OXE R10.0.45.c, with: Sip Trunk / Sip Local Gateway /SIP External Gateway.
Gateway GSM (mobile)

State
I can make calls incoming/outgoing.
I can receive DTMF.

Problem
When I make an outgoing call (ip touch, softphone, uai) I can not send DTMF

Other Info
If I make a call with a sofphone, direct pointing to GSM Gateway (not to OXE), I can send tones (DTMF).
Regardless of softphone configuration (RCF2833, INFO or IN-BAND), working properly.

Thanks.
Best Regards

[alex]

So just take a trace of a o/g calls to GSM Gateway from the softphone and a trace from, e.g., IP phone with DTMF digits sending.
Compare how this DTMF digits are sent in both cases.
May be it is just dynamic payload type misconfiguration problem.

[toro_dlp]

I have a softphone:
-pointing to GSM Gateway, works well, sending DTMF;
-pointing to GD (oxe), doesn't work sending DTMF;
In both cases, with a Wireshark I have the same results:
-RTP EVENT 58 Payload type=RTP Event, DTMF Five 5

Thanks
BestRegards

[alex]

Looks like I did not put it clear - I meant to take traces between OXE and GSM gateway when calling from IP phone when OXE is connected to GSM GW and take a trace on GSM GW when softphone is connected directly to it just to check how OXE sends DTMF digits.

[toro_dlp]

Thanks Alex,I finished with the traces capture (with 3 kind of phones: Sofphone, IpTouch and a UAI). All of them connected only with a OXE.
I have a good news and a bad news.
The good: with a softphone I can send DTMF.
The bad: with the rest, I can´t . Although with the traces, I can watch the same kind of packet "RTP EVENT".

I´ve been studing the difference between these packets, of each kind of terminal.
Suchs as 'RTP packets', "RTP EVENTS" (with the DTMF info) goes directly to the next equipment.
SoftPhone >> GSM GW..................works fine (pointing to de OXE)
IpTouch(4018)>>GSM GW ...............don´t work
UAI(4034) >> (OXE) GD >> GSM GW......don´t work

The only difference I see is that when I send a tone, (also the frame length, 58 vs 60 byte), a different number of packages 'rtp event' and 'rtp event (end)' are sent:
SoftPhone: 7 + 3 ("RTP Event" + "RTP Event (end)") ; length=58 ; payload=101 ; Volume=10;
IpTouch(4018): 4 + 3 ("RTP Event" + "RTP Event (end)"); length=60; payload=101 ; Volume=10;
UAI(4034):1+3 ("RTP Event" + "RTP Event (end)"); length=60; payload=101 ; Volume=10;

I've been testing, changing the 'Payload', but it´s the same.
I will continue testing.
Thanks.

[toro_dlp]

I keep running tests..
I tried changing:
-Without Sip User: In an incoming call, I can now see his CLI. And I can see the busy channel of the associated TrunkGroup of the Sip-Local-Gateway.
-With Sip User: I can´t see the CLI of the caller (I see the SipUser Id).

Another thing about DTMF:
-The only configuration I can do on the "GSM SIP GW" is choose between DTMF2833 or SIGNAL (i guess "in band"?:
-DTMF2833: I can receive tones but I can send it.
-SIGNAL: I can send tones but I can´t receive it.
Perhaps this info help.