On 9/6/11 5:02 PM, sathish kumar chevuru wrote:
> Hi,
>
> In case of Call Transfer using 3pcc and REFER , If the Callee sends out
> REFER without sending INVITE HOLD, What should be the behaviour of 3pcc.
>
> Does 3pcc sends out INVITE HOLD's to Caller and Callee , before
> initiating the call to Transfer Target ? Are the INVITE HOLD's to Caller and
> Callee MUST in this case ?
>
> If 3pcc doesn't send INVITE HOLD's to Caller and Callee, What happens to
> the existing RTP path between Caller and Callee ?
>
> Where do i find this information.
To be specific, we really need more info about what you are trying to do
and what assumptions you are making about the capabilities of the
various devices.
Based on what you have said, I guess you have the following situation:
A ------------- B ---------------- C
|
D ............. |
where you have an existing call between the A (caller) and C (callee)
through a B2BUA (B). Apparently C understands REFER and is using it to
request a transfer from A to D.
If so, then it is up to B to carry out the REFER correctly as seen by C.
On the other side it can do a variety of things. One of those is a "3pcc
transfer", by sending an INVITE to D, and then splicing it into the
referred call with C.
As Dale said, this is not standardized behavior. Its left for the reader
to figure out. If you have a call flow in mind, post it and people will
comment on it for you.
Good Luck,
Paul
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