asterisk users - Mar 2015 - OT - How does the blind transfer function work on Snom-870?

I am trying to determine how the transfer button on the Snom-870 works
with Asterisk.  Is the ## special code employed as when it is entered
through the handset or is the blind transfer through the phone
function accomplished in a different fashion?


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***          E-Mail is NOT a SECURE channel          ***
James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3

Am 05.03.2015 um 01:09 schrieb James B. Byrne:
> I am trying to determine how the transfer button on the Snom-870 works
> with Asterisk.  Is the ## special code employed as when it is entered
> through the handset or is the blind transfer through the phone
> function accomplished in a different fashion?
> 

Hi,

I hope I understood your question correctly.
AFAIK, the transfer button sends a SIP message.
Entering "##" on the handset is recognized via DTMF by asterisk.

On Thu, March 5, 2015 05:30, Ruben R?gels wrote:
>
>
> Am 05.03.2015 um 01:09 schrieb James B. Byrne:
>> I am trying to determine how the transfer button on the Snom-870
>> works
>> with Asterisk.  Is the ## special code employed as when it is
>> entered
>> through the handset or is the blind transfer through the phone
>> function accomplished in a different fashion?
>>
>
>
> Hi,
>
> I hope I understood your question correctly.
> AFAIK, the transfer button sends a SIP message.
> Entering "##" on the handset is recognized via DTMF by asterisk.
>
I hope that I understood what I was asking for.  Sometimes I do not.

  Yes, that is what I wanted to know.  Does the implementation of the
transfer button feature on the Snomp-870 use exactly the same
technique as the ## feature code entered through the dial pad and
produce exactly the same SIP message that Asterisk produces when it
gets the ## DTMF?

The reason is that I wish to be able to detect a call transfer
performed via either method (## or <Transfer-Button>) and process the
result of both in the same fashion. If the button and DTMF transfers
are not performed using the same switching techniques in Asterisk then
I need to discover what those differences are.  If both are totally
equivalent from a SIP message signalling point of view then the issue
is far easier to handle.

I searched, in vain, in the Snom-870 docs for specifics on this and
either could not find or did not recognize anything that applied.  Do
you know where I can locate these sorts of details.  My knowledge of
SIP/RTP/VOIP etc. is cursory but, given an adequate reference, I can
usually sort things out.

-- 
***          E-Mail is NOT a SECURE channel          ***
James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
Canada  L8E 3C3