[Serusers] Seeking Call Waiting Advise

[Andrei Pelinescu-Onciul]

On Oct 01, 2004 at 09:40, Java Rockx <javarockx at yahoo.com> wrote:
> Hello Everyone.
> 
> I've got a glitch in my call waiting feature and was hoping someone could
> suggest a way to fix it or debug it.
> 
> The Problem; I have three SIP phones. Two are Grandstream Budgetone 100's and
> the third is a Cisco ATA 186. The firmware on the Grandstreams is version
> 1.0.5.11 and the ATA 186 is version 2.16.2
> 
> If a call is established between two of the phones and the third phone calls, I
> do get the call waiting indicator. I can then press my "flash" button to take
> the call. I can also press "flash" again to return to the original caller. 
> 
> But if I press "flash" a third time to return to the new caller, audio can be
> sent but not received. It's almost like one of the RTP channels has been
> closed.
> 
> Could this be an error in my ser.cfg routing? I'm using ser-0.8.99-dev7

Are the phones behind NATs?
If so make sure you catch the re-INVITEs and force_rtp_proxy for them.


Andrei