[SIPForum-discussion] REFER in a call transfer ...

[Murali Vuppandla]

Hi All,

 

Just need some basic clarifications on SIP REFER in a transfer scenario.

 

Say there are three SIP phones that support REFER method.

 

A calls B and B answers the call. B hook flashes and blind transfers the
call to C. Ideally B would  be supplied with the ring back tone, but at the
same time some docs say that when C is in ringing state, A would be hearing
ring back tone. I'm in a state of confusion here if it's  A or B that is
supplied with Ring Back tone since that practical implementation of Transfer
seems to be a bit different from the one described there in docs.

 

To add on this, Say when B blind transfers the call to  C and C is busy .
who should be hearing the busy tone(A or B) . if you go by the practical
scenario .. when B blind transfers the call it hears the busy tone . but if
we go by the standards it's A that should be getting busy tone ..

 

To summarize the above points .

 

1)     A calls B.. B blind transfers the call to C . If C is busy with
another call .. who should be getting the busy tone(A or C).

2)     A calls B .. B blind transfers the call to C . if C is ringing who
should be getting the ring back tone .

3)     A calls B .. B blind transfers the call to C ..A goes on hook
immediately and If REFER fails .. what has to be the ideal behavior.

4)     And does the call transfer in case of Normal phones differ from the
ones that supports REFER .

 

 

Awaiting your responses on this.

 

Regards,

Murali.

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20100825/809763bb/attachment-0002.html>