Yes, indeed a Re-INVITE can be initiated in both directions by the transferor.

For e.g.:
A=transferor, B=transferee, C=transfer target

C              A              B
                 ----------> (Re-INVITE with no SDP)
                <---------- (200 OK with SDP_b)
<-------- (Re-INVITE with SDP_b)
---------> (200 OK with SDP_c)
                 -----------> (ACK with SDP_c)

-----Original Message-----
From: sip-implementors-boun...@lists.cs.columbia.edu 
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Johan DE 
CLERCQ
Sent: Tuesday, August 05, 2014 1:33 PM
To: Sourav Dhar Chaudhuri; sip-implementors@lists.cs.columbia.edu
Subject: Re: [Sip-implementors] Call transfer for an attended call without 
usingREFER method possible? - Email found in subject

you can do that by issuing a reinvite in the dialogue. 

Johan. 

-----Original Message-----
From: sip-implementors-boun...@lists.cs.columbia.edu 
[mailto:sip-implementors-boun...@lists.cs.columbia.edu] On Behalf Of Sourav 
Dhar Chaudhuri
Sent: maandag 4 augustus 2014 16:12
To: sip-implementors@lists.cs.columbia.edu
Subject: [Sip-implementors] Call transfer for an attended call without 
usingREFER method possible? - Email found in subject

Hi,
   Is there any way when a answered call  [ 200OK is already provided for 
initial INVITE and ACK also sent] can be transferred without using REFER method?

  If it is possible without REFER then please let me know required procedure.

Thanks,
Sourav Dhar Chaudhuri
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