[asterisk-users] Asterisk 13.14.0. Debugging DTMF issues

[Olivier]

Hello,

I'm working on a (PJ)SIP trunking Asterisk machine with which I'm facing
issues with DTMF.
Installed version is 13.14.0.


1. In outbound calls SDP, I'm seeing these kind of lines:
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16

I would expect events to range from 0 to 15, not to 16, as seen in rfc 4733
examples.
What is this event 16 for ?
Is there a way to configure this ?



2. With channel originated calls using Local prefix, I can read this on
console:
[2017-03-30 15:11:44] DTMF[11505][C-00000056]: channel.c:4103 __ast_read:
DTMF begin '#' received on PJSIP/Foo-0000006f
[2017-03-30 15:11:44] DTMF[11505][C-00000056]: channel.c:4114 __ast_read:
DTMF begin passthrough '#' on PJSIP/Foo-0000006f
[2017-03-30 15:11:44] DTMF[11501][C-00000057]: channel.c:4103 __ast_read:
DTMF begin '#' received on Local/2 at from-originate-00000024;1
[2017-03-30 15:11:44] DTMF[11501][C-00000057]: channel.c:4114 __ast_read:
DTMF begin passthrough '#' on Local/2 at from-originate-00000024;1
[2017-03-30 15:11:44] DTMF[11505][C-00000056]: channel.c:4017 __ast_read:
DTMF end '#' received on PJSIP/Foo-0000006f, duration 180 ms

With pure inbound-outbound calls (calls coming in from PJSIP and leaving
through PJSIP), I get this:
[2017-03-30 15:51:01] DTMF[11650][C-0000006d]: channel.c:4017 __ast_read:
DTMF end '9' received on PJSIP/Bar-IPO-00000093, duration 100 ms
[2017-03-30 15:51:01] DTMF[11650][C-0000006d]: channel.c:4044 __ast_read:
DTMF begin emulation of '9' with duration 100 queued on
PJSIP/Bar-IPO-00000093
[2017-03-30 15:51:01] DTMF[11650][C-0000006d]: channel.c:4181 __ast_read:
DTMF end emulation of '9' queued on PJSIP/Bar-IPO-00000093


Can I get both inbound and outbound DTMF on console ? How ?


3. Looking at DTMF duration (as logged by Asterisk console), I can see that
some (from mobile phone) have a 180ms duration while some, from an other
SIP trunk, have a 100ms duration.

Can I configure tone duration ? How ?
Should I configure this ?
Does this duration any real relation with the way a user presses keys ?


Best regards
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