[Asterisk-doc] rfc2833 and Grandstream

[Nicholas Bachmann]

Randy Resnick wrote:

> Common Issues -> DTMF over SIP
>
> "Users of Grandstream phones should use Info for the Asterisk 
> voicemail; the other methods won't work."
>
> "rfc2833 is similar to Info, but will not work on Grandstream phones."
>
> I don't think this is still true since I've been using rfc2833 since 
> I've owned the BT101 and 102, several months.

At the time I wrote that, it was true... perhaps Grandstream has fixed 
that issue. 

>
> A general suggestion:
>
> replace:
> "DTMF (Dual-Tone Multi-Frequency) is the name for the specific sounds 
> ("dial tones") made by the keys on a telephone keypad. The choice of 
> which method to use for DTMF over SIP is made in Asterisk's 
> /etc/asterisk/sip.conf. Carrying DTMF over SIP can be done in one of 
> three ways:"
>
> with:
> "DTMF (Dual-Tone Multi-Frequency) is the name for the specific sounds 
> ("dial tones") made by the keys on a telephone keypad. If the wrong 
> method is used, one possible symptom is that tones transmitted will 
> have no effect. The choice of which method to use for DTMF over SIP is 
> made in Asterisk's /etc/asterisk/sip.conf and will probably require 
> configuration of the phone itself. Carrying DTMF over SIP can be done 
> in one of three ways:"
>
I like that change, but remove "one possible symptom is that," since it 
is rather redundant.

Nick