[Asterisk-Users] Outgoing DTMF on BRI

[Jason Penton]

Hi Mark

Not sure what method Grandstream phones use for DTMF - I would imagine
RFC2833 as inband DTMF in VoIP is not good. I would imagine that your
problem is not with the BRI card but rather with Asterisk receiving your
DTMF from your phones. Take a look at sip.conf and make sure that:

Dtmfmode=rfc2833

If this still does not work then try setting 

Dtmfmode=inband

If this doen not work then try and find out exactly how the grandstream
phones transmit DTMF.

Also, to make sure that your BRI line is sending DTMF use an IAX client like
firefly (www.virbiage.com) with Asterisk to make a call using your BRI. Try
using DTMF now and I am sure things will work

Lemme know if you need more help

cheers
Jason

> -----Original Message-----
> From: asterisk-users-admin at lists.digium.com 
> [mailto:asterisk-users-admin at lists.digium.com] On Behalf Of 
> Mark Elkins
> Sent: 30 April 2004 11:59 AM
> To: asterisk-users at lists.digium.com
> Subject: RE: [Asterisk-Users] Outgoing DTMF on BRI
> 
> You say ...
> > Your modem.conf looks correct. Are you using the Hisax driver for 
> > ISDN4linux?
> 
> Yes - Eicon Diva card - Dumb.
> modprobe hisax type=11
> 
> dmesg includes..
> HiSax: Card 1 Protocol EDSS1 Id=HiSax (0)
> HiSax: Eicon.Diehl Diva driver Rev. 1.1.4.2
> 
> -----------------
> 
> > This is the one I used to use and all worked well.
> This one what? isdn4linux driver ?
> 
> > BTW - where is the DTMF originating from - a soft phone???? If so 
> > which one?
> 
> Grandstream BT100, Software: 1.0.4.55
> 
> Thinking... my DTMF is set to RFC2833. Should this be changed?
> DTMF Payload Type:  101   (whatever that means...)
> 
> -- 
>   .  .     ___. .__      Posix Systems - Sth Africa
>  /| /|       / /__       mje at posix.co.za  -  Mark J Elkins, Cisco CCIE
> / |/ |ARK \_/ /__ LKINS  Tel: +27 12 807 0590  Cell: +27 82 601 0496
> 
>