[asterisk-dev] DTMF-initiated transfers

[Kai Hoerner]

Hi,

Nick Lewis wrote:
>> Backwards compatibility could be a bit
>> fun though; the default when not set would have to be
>> allow_transfer=refer. 
>>     
>
> I do not understand this comment of yours.
> Wouldn't the default be allow_transfer=yes (tone&refer)?
>
> I must be misunderstanding the proposal. I assumed tone 
> transfers would be enabled only if the call had tT 
> options set and sip.conf had allow_transfer=tone. If 
> the default is allow_transfer=yes then tone transfers 
> would be controlled by the tT options as currently. 
>   

My understanding is that the Dial() options "t" and "T" should simply 
override the "allow_transfer=no" (or "=refer") setting with 
"allow_transfer=tone" (or "=yes", respectively).

This has two benefits over the other way round:

1. compatibility with old dialplans .. tT will work anywhere specified
2. you can still override this setting for special purposes in dialplan.
   Example:  When you redirect a call to a mobile phone associated
             with an extension of your PBX, you may wish to enable
             transfers for that callee, but not for the whole PSTN
             trunk.

IMHO a setting like "transfer=native,dtmf" makes more sense.
(I find "yes" actually meaning "native & dtmf" is very intransparent)


Regards,

Kaii