[Serusers] call transfer INVITE / REFER

[Samuel Osorio Calvo]

The effective transferring is done using REFER messages but since there
are several transfer methods, some INVITEs can be triggered before (put
on-hold, contact the referee). So, depending on how the user has
configured the transfer in his/her phone (blind, attended,
unattended,are there more??) the SIP request that the phone sends when
the user presses the button is different.
Take a look at the draft specifying the different transfer methods for
a detailled view of the message flows
(draft-ietf-sipping-service-examples I don't remember the most recent
number....probably 7 or 8)

Samuel.


Unclassified.
>>> Iqbal <iqbal at gigo.co.uk> 07/05/05 03:57AM >>>

which is why I am wondering if on pressing a transfer button request on
a
phone, should the first message being sent be a REFER or a INVITE,
cause
refer would make sense, although I havent looked at the rfc,

If anyone has a IP phones transferring a ngrep of transfer would be
appreciated

Iqbal

On 7/4/2005, "Nils Ohlmeier" <lists at ohlmeier.org> wrote:

>Hi,
>
>take a look at the SDP of the INVITE. Probably it just puts the other
side
>on-hold before sending the REFER.
>But I have no real clue how transfering without REFER should work.
(Except a
>cumbersome solution with Replaces and 3pcc, which I have never.)
>
>  Nils
>
>On Monday 04 July 2005 21:07, Iqbal wrote:
>> Hi
>>
>> Should the call transfer use INVITE or REFER as a method, cause I
seem,
>> to be getting INVITE, but this then causes problems with
authentication.
>>
>> A <-->B  then B transfer to C (all IP phones)
>>
>> This transfer seems fine, but it uses INVITE, no REFER . All phones
on
>> same sip domain/server
>>
>> Now when this setup changes
>>
>> pstn <---->B and then B tried to transfer to C, we get nothing, well
we
>> get 404 , it check the !location setting, and says ur not allowed.
>>
>> Is the REFER the first message to be sent, or is there a INVITE
>> transaction first,
>>
>> Iqbal
>>
>>
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>
>

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