[Freeswitch-users] Wrong Caller ID on Semi-Attended Transfer

Brian West brian at freeswitch.com
Mon Feb 1 16:50:35 UTC 2021

There is no such thing as a semi attended transfer, doing that transfer in
early media is NOT valid, its against the RFC... the fact it even works is
a trick we do, technically we should just hang up.  Your best bet is to
disable that transfer in the device.


On Mon, Feb 1, 2021 at 9:14 AM Joshua Rupp <j.rupp at onecue.de> wrote:

> Hello,
> We've a problem with the caller id in one transfer scenario:
> In our Example Party A calls Party B, Party B answers the call and
> transfers it to Party C. We're talking about the Caller ID in the phone of
> Party C now.
> If B is doing an attended or unattended transfer, the caller id ist
> updating correctly as you would expect it.
> But there's a third scenario, which is very common for users of older PBX
> systems: A so called "semi-attended transfer".
> This means, that Party B is initiating A attended transfer via BLF Key,
> but hangs up, before Party C has answered the call.
> In this case, the Caller ID should update to Party A, as soon as B hangs
> up his phone.
> But this is not happening: The Caller ID remains on Party B until C
> answers the call.  Only then the caller id is updated.
> Why is the caller id not updated after B hangs up and before C answers the
> call?
> Is there any possibility to change this behaiviour?
> Thanks for your help
> Joshua
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